117-643: Jim Nolan (born 1958) is an Irish playwright and theatre director. Born in Waterford , Nolan co-founded there the Red Kettle Theatre Company , launching the company with his play The Gods Are Angry Miss Kerr . He also formerly served as its artistic director. He was writer-in-association with the Abbey Theatre in 2001 and is also a member of Aosdána . Other plays include Blackwater Angel , Dear Kenny , Moonshine , Round and Round
234-440: A chemical equation . While in a non-nuclear chemical reaction the number and kind of atoms on both sides of the equation are equal, for a nuclear reaction this holds true only for the nuclear particles viz. protons and neutrons. The sequence of steps in which the reorganization of chemical bonds may be taking place in the course of a chemical reaction is called its mechanism . A chemical reaction can be envisioned to take place in
351-467: A chemical reaction is said to have occurred. A chemical reaction is therefore a concept related to the "reaction" of a substance when it comes in close contact with another, whether as a mixture or a solution ; exposure to some form of energy, or both. It results in some energy exchange between the constituents of the reaction as well as with the system environment, which may be designed vessels—often laboratory glassware . Chemical reactions can result in
468-470: A chemical transformation is the rearrangement of electrons in the chemical bonds between atoms. It can be symbolically depicted through a chemical equation , which usually involves atoms as subjects. The number of atoms on the left and the right in the equation for a chemical transformation is equal. (When the number of atoms on either side is unequal, the transformation is referred to as a nuclear reaction or radioactive decay .) The type of chemical reactions
585-774: A close link with the Icelandic people . In the Icelandic Laxdœla saga , for example, "even slaves are highborn, descended from the kings of Ireland." The first name of Njáll Þorgeirsson , the chief protagonist of Njáls saga , is a variation of the Irish name Neil . According to Eirik the Red's Saga , the first European couple to have a child born in North America was descended from the Viking Queen of Dublin , Aud
702-412: A dense core called the atomic nucleus surrounded by a space occupied by an electron cloud . The nucleus is made up of positively charged protons and uncharged neutrons (together called nucleons ), while the electron cloud consists of negatively charged electrons which orbit the nucleus. In a neutral atom, the negatively charged electrons balance out the positive charge of the protons. The nucleus
819-535: A directed beam in a vacuum in a mass spectrometer . Charged polyatomic collections residing in solids (for example, common sulfate or nitrate ions) are generally not considered "molecules" in chemistry. Some molecules contain one or more unpaired electrons, creating radicals . Most radicals are comparatively reactive, but some, such as nitric oxide (NO) can be stable. The "inert" or noble gas elements ( helium , neon , argon , krypton , xenon and radon ) are composed of lone atoms as their smallest discrete unit, but
936-695: A frequency of 65%. This subclade is also dominant in Scotland, Wales and Brittany and descends from a common ancestor who lived in about 2,500 BC. According to 2009 studies by Bramanti et al. and Malmström et al. on mtDNA , related western European populations appear to be largely from the neolithic and not paleolithic era, as previously thought. There was discontinuity between mesolithic central Europe and modern European populations mainly due to an extremely high frequency of haplogroup U (particularly U5) types in mesolithic central European sites. The existence of an especially strong genetic association between
1053-956: A named person. Mac is the Irish for son. Names that begin with "O'" include: Ó Bánion ( O'Banion ), Ó Briain ( O'Brien ), Ó Ceallaigh ( O'Kelly ), Ó Conchobhair ( O'Connor, O'Conor ), Ó Chonaill ( O'Connell ), O'Coiligh ( Cox ), Ó Cuilinn ( Cullen ), Ó Domhnaill ( O'Donnell ), Ó Drisceoil ( O'Driscoll ), Ó hAnnracháin, ( Hanrahan ), Ó Máille ( O'Malley ), Ó Mathghamhna ( O'Mahony ), Ó Néill ( O'Neill ), Ó Sé ( O'Shea ), Ó Súilleabháin ( O'Sullivan ), Ó Caiside/Ó Casaide ( Cassidy ), Ó Brádaigh/Mac Bradaigh ( Brady ) and Ó Tuathail ( O'Toole ). Names that begin with Mac or Mc include: Mac Cárthaigh ( McCarthy ), Mac Diarmada ( McDermott ), Mac Domhnaill ( McDonnell ), and Mac Mathghamhna ( McMahon ) Mac(g) Uidhir ( Maguire ), Mac Dhonnchadha ( McDonagh ), Mac Conmara ( MacNamara ), Mac Craith ( McGrath ), Mac Aodha ( McGee ), Mac Aonghuis ( McGuinness ), Mac Cana ( McCann ), Mac Lochlainn ( McLaughlin ) and Mac Conallaidh ( McNally ). Mac
1170-411: A number of steps, each of which may have a different speed. Many reaction intermediates with variable stability can thus be envisaged during the course of a reaction. Reaction mechanisms are proposed to explain the kinetics and the relative product mix of a reaction. Many physical chemists specialize in exploring and proposing the mechanisms of various chemical reactions. Several empirical rules, like
1287-424: A particular substance per volume of solution , and is commonly reported in mol/ dm . In addition to the specific chemical properties that distinguish different chemical classifications, chemicals can exist in several phases. For the most part, the chemical classifications are independent of these bulk phase classifications; however, some more exotic phases are incompatible with certain chemical properties. A phase
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#17328021057251404-405: A pure chemical substance that has its unique set of chemical properties, that is, its potential to undergo a certain set of chemical reactions with other substances. However, this definition only works well for substances that are composed of molecules, which is not true of many substances (see below). Molecules are typically a set of atoms bound together by covalent bonds , such that the structure
1521-609: A substance may undergo and the energy changes that may accompany it are constrained by certain basic rules, known as chemical laws . Energy and entropy considerations are invariably important in almost all chemical studies. Chemical substances are classified in terms of their structure , phase, as well as their chemical compositions . They can be analyzed using the tools of chemical analysis , e.g. spectroscopy and chromatography . Scientists engaged in chemical research are known as chemists . Most chemists specialize in one or more sub-disciplines. Several concepts are essential for
1638-570: A voyage of exploration to northwestern Europe in about 325 BC, but his account of it, known widely in Antiquity , has not survived and is now known only through the writings of others. On this voyage, he circumnavigated and visited a considerable part of modern-day Great Britain and Ireland . He was the first known scientific visitor to see and describe the Celtic and Germanic tribes. The terms Irish and Ireland are probably derived from
1755-414: A woman in Irish uses the feminine prefix nic (meaning daughter) in place of mac. Thus a boy may be called Mac Domhnaill whereas his sister would be called Nic Dhomhnaill or Ní Dhomhnaill – the insertion of 'h' follows the female prefix in the case of most consonants (bar H, L, N, R, & T). A son has the same surname as his father. A female's surname replaces Ó with Ní (reduced from Iníon Uí – "daughter of
1872-445: Is a presumed invasion of Wales , which according to a Welsh manuscript may have taken place around the 7th century. In the words of Seumas MacManus: If we compare the history of Ireland in the 6th century, after Christianity was received, with that of the 4th century, before the coming of Christianity, the wonderful change and contrast is probably more striking than any other such change in any other nation known to history. Following
1989-414: Is a pure substance which is composed of a single type of atom, characterized by its particular number of protons in the nuclei of its atoms, known as the atomic number and represented by the symbol Z . The mass number is the sum of the number of protons and neutrons in a nucleus. Although all the nuclei of all atoms belonging to one element will have the same atomic number, they may not necessarily have
2106-409: Is a set of states of a chemical system that have similar bulk structural properties, over a range of conditions, such as pressure or temperature . Physical properties, such as density and refractive index tend to fall within values characteristic of the phase. The phase of matter is defined by the phase transition , which is when energy put into or taken out of the system goes into rearranging
2223-586: Is a very useful means for predicting the feasibility of a reaction and determining the state of equilibrium of a chemical reaction, in chemical thermodynamics . A reaction is feasible only if the total change in the Gibbs free energy is negative, Δ G ≤ 0 {\displaystyle \Delta G\leq 0\,} ; if it is equal to zero the chemical reaction is said to be at equilibrium . There exist only limited possible states of energy for electrons, atoms and molecules. These are determined by
2340-422: Is also possible to define analogs in two-dimensional systems, which has received attention for its relevance to systems in biology . Atoms sticking together in molecules or crystals are said to be bonded with one another. A chemical bond may be visualized as the multipole balance between the positive charges in the nuclei and the negative charges oscillating about them. More than simple attraction and repulsion,
2457-439: Is also used to identify the composition of remote objects – like stars and distant galaxies – by analyzing their radiation spectra. The term chemical energy is often used to indicate the potential of a chemical substance to undergo a transformation through a chemical reaction or to transform other chemical substances. When a chemical substance is transformed as a result of its interaction with another substance or with energy,
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#17328021057252574-464: Is called a mixture. Examples of mixtures are air and alloys . The mole is a unit of measurement that denotes an amount of substance (also called chemical amount). One mole is defined to contain exactly 6.022 140 76 × 10 particles ( atoms , molecules , ions , or electrons ), where the number of particles per mole is known as the Avogadro constant . Molar concentration is the amount of
2691-625: Is commonly anglicised Mc. However, "Mac" and "Mc" are not mutually exclusive, so, for example, both "MacCarthy" and "McCarthy" are used. Both "Mac" and "Ó'" prefixes are both Irish in origin, Anglicized Prefix Mc is far more common in Ireland than Scotland with 2/3 of all Mc Surnames being Irish in origin However, "Mac" is more common in Scotland and Ulster than in the rest of Ireland; furthermore, "Ó" surnames are less common in Scotland having been brought to Scotland from Ireland. The proper surname for
2808-523: Is composed of gaseous matter that has been completely ionized, usually through high temperature. A substance can often be classified as an acid or a base . There are several different theories which explain acid–base behavior. The simplest is Arrhenius theory , which states that acid is a substance that produces hydronium ions when it is dissolved in water, and a base is one that produces hydroxide ions when dissolved in water. According to Brønsted–Lowry acid–base theory , acids are substances that donate
2925-472: Is dense; the mass of a nucleon is approximately 1,836 times that of an electron, yet the radius of an atom is about 10,000 times that of its nucleus. The atom is also the smallest entity that can be envisaged to retain the chemical properties of the element, such as electronegativity , ionization potential , preferred oxidation state (s), coordination number , and preferred types of bonds to form (e.g., metallic , ionic , covalent ). A chemical element
3042-464: Is electrically neutral and all valence electrons are paired with other electrons either in bonds or in lone pairs . Thus, molecules exist as electrically neutral units, unlike ions. When this rule is broken, giving the "molecule" a charge, the result is sometimes named a molecular ion or a polyatomic ion. However, the discrete and separate nature of the molecular concept usually requires that molecular ions be present only in well-separated form, such as
3159-645: Is formed and how environmental pollutants are degraded ( ecology ), the properties of the soil on the Moon ( cosmochemistry ), how medications work ( pharmacology ), and how to collect DNA evidence at a crime scene ( forensics ). Chemistry has existed under various names since ancient times. It has evolved, and now chemistry encompasses various areas of specialisation, or subdisciplines, that continue to increase in number and interrelate to create further interdisciplinary fields of study. The applications of various fields of chemistry are used frequently for economic purposes in
3276-529: Is made up of the Republic of Ireland (officially called Ireland ) and Northern Ireland (a part of the United Kingdom ). The people of Northern Ireland hold various national identities including Irish, British or some combination thereof. The Irish have their own unique customs, language , music , dance , sports , cuisine and mythology . Although Irish (Gaeilge) was their main language in
3393-537: Is more easily transferred between substances relative to light or other forms of electronic energy. For example, ultraviolet electromagnetic radiation is not transferred with as much efficacy from one substance to another as thermal or electrical energy. The existence of characteristic energy levels for different chemical substances is useful for their identification by the analysis of spectral lines . Different kinds of spectra are often used in chemical spectroscopy , e.g. IR , microwave , NMR , ESR , etc. Spectroscopy
3510-420: Is no archaeological or placename evidence for a migration or a takeover by a small group of elites. He states that "the Irish migration hypothesis seems to be a classic case of long-held historical beliefs influencing not only the interpretation of documentary sources themselves but the subsequent invasion paradigm being accepted uncritically in the related disciplines of archaeology and linguistics." Dál Riata and
3627-495: Is that they are descendants of Spanish traders or of the few sailors of the Spanish Armada who were shipwrecked on Ireland's west coast, but there is little evidence for this. Irish Travellers are an ethnic people of Ireland . A DNA study found they originally descended from the general Irish population, however, they are now very distinct from it. The emergence of Travellers as a distinct group occurred long before
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3744-468: Is the crystal structure , or arrangement, of the atoms. Another phase commonly encountered in the study of chemistry is the aqueous phase, which is the state of substances dissolved in aqueous solution (that is, in water). Less familiar phases include plasmas , Bose–Einstein condensates and fermionic condensates and the paramagnetic and ferromagnetic phases of magnetic materials. While most familiar phases deal with three-dimensional systems, it
3861-458: Is the quantum mechanical model . Traditional chemistry starts with the study of elementary particles , atoms , molecules , substances , metals , crystals and other aggregates of matter . Matter can be studied in solid, liquid, gas and plasma states , in isolation or in combination. The interactions, reactions and transformations that are studied in chemistry are usually the result of interactions between atoms, leading to rearrangements of
3978-507: Is the probability of a molecule to have energy greater than or equal to E at the given temperature T. This exponential dependence of a reaction rate on temperature is known as the Arrhenius equation . The activation energy necessary for a chemical reaction to occur can be in the form of heat, light, electricity or mechanical force in the form of ultrasound . A related concept free energy , which also incorporates entropy considerations,
4095-526: Is useful in identifying periodic trends . A compound is a pure chemical substance composed of more than one element. The properties of a compound bear little similarity to those of its elements. The standard nomenclature of compounds is set by the International Union of Pure and Applied Chemistry (IUPAC). Organic compounds are named according to the organic nomenclature system. The names for inorganic compounds are created according to
4212-649: The Abbey of St Gall in Switzerland, and Bobbio Abbey in Italy. Common to both the monastic and the secular bardic schools were Irish and Latin . With Latin, the early Irish scholars "show almost a like familiarity that they do with their own Gaelic". There is evidence also that Hebrew and Greek were studied, the latter probably being taught at Iona. "The knowledge of Greek", says Professor Sandys in his History of Classical Scholarship, "which had almost vanished in
4329-516: The Brehons would hold their courts upon hills to arbitrate the matters of the lordship. Indeed, the Tudor lawyer John Davies described the Irish people with respect to their laws: There is no people under the sun that doth love equal and indifferent (impartial) justice better than the Irish, or will rest better satisfied with the execution thereof, although it be against themselves, as they may have
4446-481: The Great Famine , a genetic analysis shows. The research suggests that Traveller origins may in fact date as far back as 420 years to 1597. The Plantation of Ulster began around that time, with native Irish displaced from the land, perhaps to form a nomadic population. One Roman historian records that the Irish people were divided into "sixteen different nations" or tribes. Traditional histories assert that
4563-687: The Irish diaspora one of the largest of any nation. Historically, emigration from Ireland has been the result of conflict, famine and economic issues. People of Irish descent are found mainly in English-speaking countries, especially Great Britain , the United States , Canada , New Zealand and Australia . There are also significant numbers in Argentina , Mexico , Brazil , Germany , and The United Arab Emirates . The United States has
4680-755: The MacGrath . Irish physicians, such as the O'Briens in Munster or the MacCailim Mor in the Western Isles , were renowned in the courts of England, Spain, Portugal and the Low Countries. Learning was not exclusive to the hereditary learned families, however; one such example is Cathal Mac Manus , the 15th century diocesan priest who wrote the Annals of Ulster . Other learned families included
4797-633: The Mic Aodhagáin and Clann Fhir Bhisigh . It was this latter family which produced Dubhaltach Mac Fhirbhisigh , the 17th century genealogist and compiler of the Leabhar na nGenealach . (see also Irish medical families ). The 16th century Age of exploration brought an interest among the English to colonize Ireland with the reign of the Tudors. King Henry IV established surrender and regrants to
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4914-819: The Penal laws . A knowledge of Latin was common among the poor Irish mountaineers in the 17th century, who spoke it on special occasions, while cattle were bought and sold in Greek in the mountain market-places of County Kerry . For a comparatively small population of about 6 million people, Ireland made an enormous contribution to literature. Irish literature encompasses the Irish and English languages. Notable Irish writers , playwrights and poets include Jonathan Swift , Laurence Sterne , Oscar Wilde , Oliver Goldsmith , James Joyce , George Bernard Shaw , Samuel Beckett , Bram Stoker , W.B. Yeats , Séamus Heaney and Brendan Behan . Known as An Górta Mór ("The Great Hurt") in
5031-465: The West Country Men , were active in Ireland at around this time. The Enterprise of Ulster which pitted Shane O'Neill (Irish chieftain) against Queen Elizabeth I was a total failure This was followed by the somewhat successful first British-English colony the Munster planations which had a population of 4,000 in 1580 and in the 1620s may have grown to 16,000 After the defeat of
5148-509: The Woodward–Hoffmann rules often come in handy while proposing a mechanism for a chemical reaction. According to the IUPAC gold book, a chemical reaction is "a process that results in the interconversion of chemical species." Accordingly, a chemical reaction may be an elementary reaction or a stepwise reaction . An additional caveat is made, in that this definition includes cases where
5265-455: The chemical bonds which hold atoms together. Such behaviors are studied in a chemistry laboratory . The chemistry laboratory stereotypically uses various forms of laboratory glassware . However glassware is not central to chemistry, and a great deal of experimental (as well as applied/industrial) chemistry is done without it. A chemical reaction is a transformation of some substances into one or more different substances. The basis of such
5382-493: The chemical industry . The word chemistry comes from a modification during the Renaissance of the word alchemy , which referred to an earlier set of practices that encompassed elements of chemistry, metallurgy , philosophy , astrology , astronomy , mysticism , and medicine . Alchemy is often associated with the quest to turn lead or other base metals into gold, though alchemists were also interested in many of
5499-469: The duet rule , and in this way they are reaching the electron configuration of the noble gas helium , which has two electrons in its outer shell. Similarly, theories from classical physics can be used to predict many ionic structures. With more complicated compounds, such as metal complexes , valence bond theory is less applicable and alternative approaches, such as the molecular orbital theory, are generally used. See diagram on electronic orbitals. In
5616-510: The inorganic nomenclature system. When a compound has more than one component, then they are divided into two classes, the electropositive and the electronegative components. In addition the Chemical Abstracts Service has devised a method to index chemical substances. In this scheme each chemical substance is identifiable by a number known as its CAS registry number . A molecule is the smallest indivisible portion of
5733-500: The interconversion of conformers is experimentally observable. Such detectable chemical reactions normally involve sets of molecular entities as indicated by this definition, but it is often conceptually convenient to use the term also for changes involving single molecular entities (i.e. 'microscopic chemical events'). An ion is a charged species, an atom or a molecule, that has lost or gained one or more electrons. When an atom loses an electron and thus has more protons than electrons,
5850-529: The intermolecular forces of a substance are such that the energy of the surroundings is not sufficient to overcome them, it occurs in a more ordered phase like liquid or solid as is the case with water (H 2 O); a liquid at room temperature because its molecules are bound by hydrogen bonds . Whereas hydrogen sulfide (H 2 S) is a gas at room temperature and standard pressure, as its molecules are bound by weaker dipole–dipole interactions . The transfer of energy from one chemical substance to another depends on
5967-438: The size of energy quanta emitted from one substance. However, heat energy is often transferred more easily from almost any substance to another because the phonons responsible for vibrational and rotational energy levels in a substance have much less energy than photons invoked for the electronic energy transfer. Thus, because vibrational and rotational energy levels are more closely spaced than electronic energy levels, heat
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#17328021057256084-653: The Ciannachta, Eóganachta, and possibly the Soghain, a deified ancestor. This practice is paralleled by the Anglo-Saxon dynasties. One legend states that the Irish were descended from the Milesians , who supposedly conquered Ireland around 1000 BC or later. Haplogroup R1b is the dominant haplogroup among Irish males, reaching a frequency of almost 80%. R-L21 is the dominant subclade within Ireland, reaching
6201-678: The Deep-minded , and a Gaelic slave brought to Iceland. The arrival of the Anglo-Normans brought also the Welsh , Flemish , Anglo-Saxons , and Bretons . Most of these were assimilated into Irish culture and polity by the 15th century, with the exception of some of the walled towns and the Pale areas. The Late Middle Ages also saw the settlement of Scottish gallowglass families of mixed Gaelic-Norse and Pict descent, mainly in
6318-596: The Fianna and the Fenian Cycle were purely fictional, they would still be representative of the character of the Irish people: ...such beautiful fictions of such beautiful ideals, by themselves, presume and prove beautiful-souled people, capable of appreciating lofty ideals. The introduction of Christianity to the Irish people during the 5th century brought a radical change to the Irish people's foreign relations. The only military raid abroad recorded after that century
6435-598: The Garden , The Black Pool , The Boathouse , The Guernica Hotel , The Road to Carne , Sky Road and Brighton . His play The Salvage Shop , was nominated for the Irish Times/ESB Theatre Award for Best New Play. In 2011 & 2012, he is theatre artist in residence at Garter Lane Arts Centre, with the support of the Arts Council and Waterford City Council, and he is a current board member of
6552-537: The Irish and other Celtic populations (Welsh, Highland Scots and Cornish) and showing a possible link to the Bretons ; and a 'West Norwegian' component related to the Viking era. As of 2016, 10,100 Irish nationals of African descent referred to themselves as "Black Irish" in the national census. The term "Black Irish" is sometimes used outside Ireland to refer to Irish people with black hair and dark eyes. One theory
6669-583: The Irish and the Basques was first challenged in 2005, and in 2007 scientists began looking at the possibility of a more recent Mesolithic- or even Neolithic-era entrance of R1b into Europe. A new study published in 2010 by Balaresque et al. implies either a Mesolithic- or Neolithic- (not Paleolithic-) era entrance of R1b into Europe. Unlike previous studies, large sections of autosomal DNA were analyzed in addition to paternal Y-DNA markers. They detected an autosomal component present in modern Europeans which
6786-673: The Irish came to be seen as a nation of "saints and scholars". The 6th-century Irish monk and missionary Columbanus is regarded as one of the "fathers of Europe", followed by saints Cillian and Fergal . The scientist Robert Boyle is considered the "father of chemistry ", and Robert Mallet one of the "fathers of seismology ". Irish literature has produced famous writers in both Irish- and English-language traditions, such as Eoghan Rua Ó Súilleabháin , Dáibhí Ó Bruadair , Jonathan Swift , Oscar Wilde , W. B. Yeats , Samuel Beckett , James Joyce , Máirtín Ó Cadhain , Eavan Boland , and Seamus Heaney . Notable Irish explorers include Brendan
6903-481: The Irish have been primarily a Gaelic people (see Gaelic Ireland ). From the 9th century, small numbers of Vikings settled in Ireland, becoming the Norse-Gaels . Anglo-Normans also conquered parts of Ireland in the 12th century, while England 's 16th/17th century conquest and colonisation of Ireland brought many English and Lowland Scots to parts of the island, especially the north. Today, Ireland
7020-513: The Irish in Ulster in the Nine Years' War (Ireland) ; which was not exclusively confined to Ulster. The English would try again to colonize Ireland fearing another rebellion in Ulster, using previous colonial Irish endeavours as their influence. King James would succeed Queen Elizabeth the I, because King James I was previously King James VI of Scotland, he would plant both English and Scottish in
7137-513: The Irish language, during the famine millions of Irish people died and emigrated during Ireland's largest famine. The famine lasted from 1845 - 1849, and it was worst in the year 1847, which became known as Black '47. The famine occurred due to the extremely impoverished Irish population's staple food the potato being infected with Blight , and the British administration appropriating all other crops and livestock to feed her armies abroad. This meant
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#17328021057257254-423: The Irish shows that there is fine-scale population structure between different regional populations of the island, with the largest difference between native 'Gaelic' Irish populations and those of Ulster Protestants known to have recent, partial British ancestry. They were also found to have most similarity to two main ancestral sources: a 'French' component (mostly northwestern French) which reached highest levels in
7371-487: The Irish, but it was not until the Catholic queen Mary I of England who started the first plantations in Ireland in 1550, this would become the model for English colonization moving forward in Ireland and would later form the British imperial model The 1550 plantation counties were known as Philipstown (now Daingean) and Maryborough (now Portlaoise) named by the English planters at the time. A group of explorers, known as
7488-538: The Navigator , Sir Robert McClure , Sir Alexander Armstrong , Sir Ernest Shackleton and Tom Crean . By some accounts, the first European child born in North America had Irish descent on both sides. Many presidents of the United States have had some Irish ancestry. The population of Ireland is about 6.9 million, but it is estimated that 50 to 80 million people around the world have Irish forebears, making
7605-685: The Romans never attempted to conquer Ireland, although it may have been considered. The Irish were not, however, cut off from Europe; they frequently raided the Roman territories, and also maintained trade links. Among the most famous people of ancient Irish history are the High Kings of Ireland , such as Cormac mac Airt and Niall of the Nine Hostages , and the semi-legendary Fianna . The 20th-century writer Seumas MacManus wrote that even if
7722-515: The Valence Shell Electron Pair Repulsion model ( VSEPR ), and the concept of oxidation number can be used to explain molecular structure and composition. An ionic bond is formed when a metal loses one or more of its electrons, becoming a positively charged cation, and the electrons are then gained by the non-metal atom, becoming a negatively charged anion. The two oppositely charged ions attract one another, and
7839-494: The atom is a positively charged ion or cation . When an atom gains an electron and thus has more electrons than protons, the atom is a negatively charged ion or anion . Cations and anions can form a crystalline lattice of neutral salts , such as the Na and Cl ions forming sodium chloride , or NaCl. Examples of polyatomic ions that do not split up during acid–base reactions are hydroxide (OH ) and phosphate (PO 4 ). Plasma
7956-581: The centre. Jim's daughter, Megan Nolan , is a journalist and author. Currently directing a version of Under Milk Wood by Dylan Thomas with Waterford Youth Arts in (2024) Irish people The Irish ( Irish : Na Gaeil or Na hÉireannaigh ) are an ethnic group and nation native to the island of Ireland , who share a common ancestry, history and culture . There have been humans in Ireland for about 33,000 years, and it has been continually inhabited for more than 10,000 years (see Prehistoric Ireland ). For most of Ireland's recorded history ,
8073-412: The context of chemistry, energy is an attribute of a substance as a consequence of its atomic , molecular or aggregate structure . Since a chemical transformation is accompanied by a change in one or more of these kinds of structures, it is invariably accompanied by an increase or decrease of energy of the substances involved. Some energy is transferred between the surroundings and the reactants of
8190-535: The conversion of the Irish to Christianity, Irish secular laws and social institutions remained in place. The 'traditional' view is that, in the 4th or 5th century, Goidelic language and Gaelic culture was brought to Scotland by settlers from Ireland, who founded the Gaelic kingdom of Dál Riata on Scotland's west coast. This is based mostly on medieval writings from the 9th and 10th centuries. The archaeologist Ewan Campbell argues against this view, saying that there
8307-418: The crew list of 1492, no Irish or English sailors were involved in the voyage. An English report of 1515 states that the Irish people were divided into over sixty Gaelic lordships and thirty Anglo-Irish lordships. The English term for these lordships was "nation" or "country". The Irish term " oireacht " referred to both the territory and the people ruled by the lord. Literally, it meant an "assembly", where
8424-673: The crop failed and turned black. Starving people who tried to eat them would only vomit it back up soon afterwards. Soup kitchens were set up but made little difference. The British government produced little aid, only sending raw corn known as 'Peel's Brimstone' to Ireland. It was known by this name after the British Prime Minister at the time, Robert Peel , and the fact that many Irish weren't aware of how to cook corn. This led to little or no improvement. The British government set up workhouses which were disease-ridden (with cholera, TB and others) but they also failed as little food
8541-630: The cultural unity of Europe", and it was the 6th-century Irish monk Columbanus who is regarded as "one of the fathers of Europe". Another Irish saint, Aidan of Lindisfarne , has been proposed as a possible patron saint of the United Kingdom, while Saints Kilian and Vergilius became the patron saints of Würzburg in Germany and Salzburg in Austria, respectively. Irish missionaries founded monasteries outside Ireland, such as Iona Abbey ,
8658-534: The defeat of the Irish rebels would also plant New English in Ireland, known as the Protestant ascendency. There have been notable Irish scientists. The Anglo-Irish scientist Robert Boyle (1627–1691) is considered the father of chemistry for his book The Sceptical Chymist , written in 1661. Boyle was an atomist , and is best known for Boyle's Law . The hydrographer Rear Admiral Francis Beaufort (1774–1857), an Irish naval officer of Huguenot descent,
8775-429: The energies and distributions characterize the availability of an electron to bond to another atom. The chemical bond can be a covalent bond , an ionic bond , a hydrogen bond or just because of Van der Waals force . Each of these kinds of bonds is ascribed to some potential. These potentials create the interactions which hold atoms together in molecules or crystals . In many simple compounds, valence bond theory ,
8892-917: The families who bear them appear to have had Gaelic origins. "Fitz" is an old Norman French variant of the Old French word fils (variant spellings filz , fiuz , fiz , etc.), used by the Normans, meaning son . The Normans themselves were descendants of Vikings , who had settled in Normandy and thoroughly adopted the French language and culture. With the exception of the Gaelic-Irish Fitzpatrick ( Mac Giolla Phádraig ) surname, all names that begin with Fitz – including FitzGerald (Mac Gearailt), Fitzsimons (Mac Síomóin/Mac an Ridire) and FitzHenry (Mac Anraí) – are descended from
9009-411: The famine. The Great Famine is one of the biggest events in Irish history and is ingrained in the identity on the nation to this day. It was a major factor in Irish nationalism and Ireland's fight for independence during subsequent rebellions, as many Irish people felt a stronger need to regain independence from British rule after the famine. Chemistry Chemistry is the scientific study of
9126-444: The formation or dissociation of molecules, that is, molecules breaking apart to form two or more molecules or rearrangement of atoms within or across molecules. Chemical reactions usually involve the making or breaking of chemical bonds. Oxidation, reduction , dissociation , acid–base neutralization and molecular rearrangement are some examples of common chemical reactions. A chemical reaction can be symbolically depicted through
9243-478: The founding of many of Ireland's most important towns, including Cork , Dublin, Limerick , and Waterford (earlier Gaelic settlements on these sites did not approach the urban nature of the subsequent Norse trading ports). The Vikings left little impact on Ireland other than towns and certain words added to the Irish language, but many Irish taken as slaves inter-married with the Scandinavians, hence forming
9360-513: The goddess Ériu . A variety of tribal groups and dynasties have inhabited the island, including the Airgialla , Fir Ol nEchmacht , Delbhna , the mythical Fir Bolg , Érainn , Eóganachta , Mairtine , Conmaicne , Soghain , and Ulaid . In the cases of the Conmaicne, Delbhna, and perhaps Érainn, it can be demonstrated that the tribe took their name from their chief deity, or in the case of
9477-416: The grandson of") and Mac with Nic (reduced from Iníon Mhic – "daughter of the son of"); in both cases the following name undergoes lenition. However, if the second part of the surname begins with the letter C or G, it is not lenited after Nic. Thus the daughter of a man named Ó Maolagáin has the surname Ní Mhaolagáin and the daughter of a man named Mac Gearailt has the surname Nic Gearailt . When anglicised,
9594-707: The initial Norman settlers. A small number of Irish families of Goidelic origin came to use a Norman form of their original surname—so that Mac Giolla Phádraig became Fitzpatrick—while some assimilated so well that the Irish name was dropped in favour of a new, Hiberno-Norman form. Another common Irish surname of Norman Irish origin is the 'de' habitational prefix, meaning 'of' and originally signifying prestige and land ownership. Examples include de Búrca (Burke), de Brún, de Barra (Barry), de Stac (Stack), de Tiúit, de Faoite (White), de Londras (Landers), de Paor (Power). The Irish surname "Walsh" (in Irish Breathnach )
9711-445: The ionic bond is the electrostatic force of attraction between them. For example, sodium (Na), a metal, loses one electron to become an Na cation while chlorine (Cl), a non-metal, gains this electron to become Cl . The ions are held together due to electrostatic attraction, and that compound sodium chloride (NaCl), or common table salt, is formed. In a covalent bond, one or more pairs of valence electrons are shared by two atoms:
9828-473: The main characteristics of a molecule is its geometry often called its structure . While the structure of diatomic, triatomic or tetra-atomic molecules may be trivial, (linear, angular pyramidal etc.) the structure of polyatomic molecules, that are constituted of more than six atoms (of several elements) can be crucial for its chemical nature. A chemical substance is a kind of matter with a definite composition and set of properties . A collection of substances
9945-539: The majority of Irish emigrants to Australia were in fact prisoners. A substantial proportion of these committed crimes in hopes of being extradited to Australia, favouring it to the persecution and hardships they endured in their homeland. Emigrants travelled on ' Coffin Ships' , which got their name from the often high mortality rates on board. Many died of disease or starved. Conditions on board were abysmal - tickets were expensive so stowaways were common, and little food stuff
10062-540: The most people of Irish descent, while in Australia those of Irish descent are a higher percentage of the population than in any other country outside Ireland. Many Icelanders have Irish and Scottish Gaelic ancestors due to transportation there as slaves by the Vikings during their settlement of Iceland . During the past 33,000 years, Ireland has witnessed different peoples arrive on its shores. Pytheas made
10179-590: The name can remain O' or Mac, regardless of gender. There are a number of Irish surnames derived from Norse personal names, including Mac Suibhne (Sweeney) from Swein and McAuliffe from "Olaf". The name Cotter , local to County Cork , derives from the Norse personal name Ottir. The name Reynolds is an Anglicization of the Irish Mac Raghnaill, itself originating from the Norse names Randal or Reginald. Though these names were of Viking derivation some of
10296-508: The north; due to similarities of language and culture they too were assimilated. The Irish were among the first people in Europe to use surnames as we know them today. It is very common for people of Gaelic origin to have the English versions of their surnames beginning with 'Ó' or 'Mac' (Over time however many have been shortened to 'O' or Mc). 'O' comes from the Irish Ó which in turn came from Ua, which means " grandson ", or " descendant " of
10413-637: The original Neolithic farming population was most similar to present-day Sardinians , while the three Bronze Age remains had a large genetic component from the Pontic-Caspian steppe . Modern Irish are the population most genetically similar to the Bronze Age remains, followed by Scottish and Welsh, and share more DNA with the three Bronze Age men from Rathlin Island than with the earlier Ballynahatty Neolithic woman. A 2017 genetic study done on
10530-419: The other isolated chemical elements consist of either molecules or networks of atoms bonded to each other in some way. Identifiable molecules compose familiar substances such as water, air, and many organic compounds like alcohol, sugar, gasoline, and the various pharmaceuticals . However, not all substances or chemical compounds consist of discrete molecules, and indeed most of the solid substances that make up
10647-423: The past, today most Irish people speak English as their first language. Historically, the Irish nation was made up of kin groups or clans , and the Irish also had their own religion , law code , alphabet and style of dress . There have been many notable Irish people throughout history. After Ireland's conversion to Christianity , Irish missionaries and scholars exerted great influence on Western Europe, and
10764-515: The plantations and went into decline. Among the last of the true bardic poets were Brian Mac Giolla Phádraig (c. 1580–1652) and Dáibhí Ó Bruadair (1625–1698). The Irish poets of the late 17th and 18th centuries moved toward more modern dialects. Among the most prominent of this period were Séamas Dall Mac Cuarta , Peadar Ó Doirnín , Art Mac Cumhaigh , Cathal Buí Mac Giolla Ghunna , and Seán Clárach Mac Domhnaill . Irish Catholics continued to receive an education in secret "hedgeschools", in spite of
10881-583: The plantations of Ulster drawing upon the Munster Plantations, this proved to be the most successful they were settled in what's mostly Now Northern Ireland. The Plantations of Ireland introduced Tudor English settlers to Ireland, while The Plantation of Ulster in the 17th century introduced a great number of Scottish and to a lesser extent English as well as French Huguenots as colonists. All previous endeavours were solely an English venture. The Lord Protector Oliver Cromwell (1653–1658) after
10998-426: The properties and behavior of matter . It is a physical science within the natural sciences that studies the chemical elements that make up matter and compounds made of atoms , molecules and ions : their composition, structure, properties, behavior and the changes they undergo during reactions with other substances . Chemistry also addresses the nature of chemical bonds in chemical compounds . In
11115-493: The protection and benefit of the law upon which just cause they do desire it. Another English commentator records that the assemblies were attended by "all the scum of the country"—the labouring population as well as the landowners. While the distinction between "free" and "unfree" elements of the Irish people was unreal in legal terms, it was a social and economic reality. Social mobility was usually downwards, due to social and economic pressures. The ruling clan's "expansion from
11232-631: The questions of modern chemistry. The modern word alchemy in turn is derived from the Arabic word al-kīmīā ( الكیمیاء ). This may have Egyptian origins since al-kīmīā is derived from the Ancient Greek χημία , which is in turn derived from the word Kemet , which is the ancient name of Egypt in the Egyptian language. Alternately, al-kīmīā may derive from χημεία 'cast together'. The current model of atomic structure
11349-478: The reaction absorbs heat from the surroundings. Chemical reactions are invariably not possible unless the reactants surmount an energy barrier known as the activation energy . The speed of a chemical reaction (at given temperature T) is related to the activation energy E, by the Boltzmann's population factor e − E / k T {\displaystyle e^{-E/kT}} – that
11466-433: The reaction in the form of heat or light ; thus the products of a reaction may have more or less energy than the reactants. A reaction is said to be exergonic if the final state is lower on the energy scale than the initial state; in the case of endergonic reactions the situation is the reverse. A reaction is said to be exothermic if the reaction releases heat to the surroundings; in the case of endothermic reactions ,
11583-544: The resulting electrically neutral group of bonded atoms is termed a molecule . Atoms will share valence electrons in such a way as to create a noble gas electron configuration (eight electrons in their outermost shell) for each atom. Atoms that tend to combine in such a way that they each have eight electrons in their valence shell are said to follow the octet rule . However, some elements like hydrogen and lithium need only two electrons in their outermost shell to attain this stable configuration; these atoms are said to follow
11700-403: The rules of quantum mechanics , which require quantization of energy of a bound system. The atoms/molecules in a higher energy state are said to be excited. The molecules/atoms of substance in an excited energy state are often much more reactive; that is, more amenable to chemical reactions. The phase of a substance is invariably determined by its energy and the energy of its surroundings. When
11817-474: The same mass number; atoms of an element which have different mass numbers are known as isotopes . For example, all atoms with 6 protons in their nuclei are atoms of the chemical element carbon , but atoms of carbon may have mass numbers of 12 or 13. The standard presentation of the chemical elements is in the periodic table , which orders elements by atomic number. The periodic table is arranged in groups , or columns, and periods , or rows. The periodic table
11934-408: The scope of its subject, chemistry occupies an intermediate position between physics and biology . It is sometimes called the central science because it provides a foundation for understanding both basic and applied scientific disciplines at a fundamental level. For example, chemistry explains aspects of plant growth ( botany ), the formation of igneous rocks ( geology ), how atmospheric ozone
12051-645: The solid crust, mantle, and core of the Earth are chemical compounds without molecules. These other types of substances, such as ionic compounds and network solids , are organized in such a way as to lack the existence of identifiable molecules per se . Instead, these substances are discussed in terms of formula units or unit cells as the smallest repeating structure within the substance. Examples of such substances are mineral salts (such as table salt ), solids like carbon and diamond, metals, and familiar silica and silicate minerals such as quartz and granite. One of
12168-695: The structure of the system, instead of changing the bulk conditions. Sometimes the distinction between phases can be continuous instead of having a discrete boundary' in this case the matter is considered to be in a supercritical state. When three states meet based on the conditions, it is known as a triple point and since this is invariant, it is a convenient way to define a set of conditions. The most familiar examples of phases are solids , liquids , and gases . Many substances exhibit multiple solid phases. For example, there are three phases of solid iron (alpha, gamma, and delta) that vary based on temperature and pressure. A principal difference between solid phases
12285-421: The study of chemistry; some of them are: In chemistry, matter is defined as anything that has rest mass and volume (it takes up space) and is made up of particles . The particles that make up matter have rest mass as well – not all particles have rest mass, such as the photon . Matter can be a pure chemical substance or a mixture of substances. The atom is the basic unit of chemistry. It consists of
12402-631: The territory of the neighbouring Picts merged to form the Kingdom of Alba , and Goidelic language and Gaelic culture became dominant there. The country came to be called Scotland , after the Roman name for the Gaels: Scoti . The Isle of Man and the Manx people also came under massive Gaelic influence in their history. Irish missionaries such as Saint Columba brought Christianity to Pictish Scotland . The Irishmen of this time were also "aware of
12519-480: The top downwards" was constantly displacing commoners and forcing them into the margins of society. As a clan-based society, genealogy was all important. Ireland 'was justly styled a "Nation of Annalists"'. The various branches of Irish learning—including law, poetry, history and genealogy, and medicine—were associated with hereditary learned families. The poetic families included the Uí Dhálaigh (Daly) and
12636-533: The use of a common language and mass Irish migration to Scotland in the late 19th and early to mid-20th centuries. The Irish people of the Late Middle Ages were active as traders on the European continent. They were distinguished from the English (who only used their own language or French) in that they only used Latin abroad—a language "spoken by all educated people throughout Gaeldom". According to
12753-515: The west was so widely dispersed in the schools of Ireland that if anyone knew Greek it was assumed he must have come from that country."' Since the time of Charlemagne , Irish scholars had a considerable presence in the Frankish court , where they were renowned for their learning. The most significant Irish intellectual of the early monastic period was the 9th century Johannes Scotus Eriugena , an outstanding philosopher in terms of originality. He
12870-469: The writer Seumas MacManus , the explorer Christopher Columbus visited Ireland to gather information about the lands to the west, a number of Irish names are recorded on Columbus' crew roster preserved in the archives of Madrid and it was an Irishman named Patrick Maguire who was the first to set foot in the Americas in 1492; however, according to Morison and Miss Gould , who made a detailed study of
12987-494: Was available and many died on arrival as they were overworked. Some British political figures at the time saw the famine as a purge from God to exterminate the majority of the native Irish population. Irish people emigrated to escape the famine journeying predominantly to the east coast of the United States , especially Boston and New York , as well as Liverpool in England, Australia, Canada and New Zealand. Many records show
13104-656: Was given to passengers who were simply viewed as cargo in the eyes of the ship workers. Notable coffin ships include the Jeanie Johnston and the Dunbrody . There are statues and memorials in Dublin, New York and other cities in memory of the famine. The Fields of Athenry is a late-20th century song about the Great Famine and is often sung at national team sporting events in memory and homage to those affected by
13221-439: Was in question, something that has been diminished with the loss of prefixes such as Ó and Mac. Different branches of a family with the same surname sometimes used distinguishing epithets, which sometimes became surnames in their own right. Hence the chief of the clan Ó Cearnaigh (Kearney) was referred to as An Sionnach (Fox), which his descendants use to this day. Similar surnames are often found in Scotland for many reasons, such as
13338-621: Was not present in Neolithic or Mesolithic Europeans, and which would have been introduced into Europe with paternal lineages R1b and R1a, as well as the Indo-European languages. This genetic component, labelled as " Yamnaya " in the studies, then mixed to varying degrees with earlier Mesolithic hunter-gatherer and Neolithic farmer populations already existing in western Europe. A more recent whole genome analysis of Neolithic and Bronze Age skeletal remains from Ireland suggested that
13455-453: Was routinely given to settlers of Welsh origin, who had come during and after the Norman invasion. The Joyce and Griffin/Griffith (Gruffydd) families are also of Welsh origin. The Mac Lochlainn, Ó Maol Seachlainn, Ó Maol Seachnaill, Ó Conchobhair, Mac Loughlin and Mac Diarmada families, all distinct, are now all subsumed together as MacLoughlin. The full surname usually indicated which family
13572-603: Was the creator of the Beaufort scale for indicating wind force. George Boole (1815–1864), the mathematician who invented Boolean algebra , spent the latter part of his life in Cork . The 19th century physicist George Stoney introduced the idea and the name of the electron . He was the uncle of another notable physicist, George FitzGerald . The Irish bardic system, along with the Gaelic culture and learned classes, were upset by
13689-593: Was the earliest of the founders of scholasticism , the dominant school of medieval philosophy . He had considerable familiarity with the Greek language, and translated many works into Latin, affording access to the Cappadocian Fathers and the Greek theological tradition , previously almost unknown in the Latin West. The influx of Viking raiders and traders in the 9th and 10th centuries resulted in
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