100-541: Geraldton ( Wajarri : Jambinu , Wilunyu : Jambinbirri ) is a coastal city in the Mid West region of Western Australia , 424 kilometres (263 mi) north of the state capital, Perth . As of the 2021 census , Geraldton had an urban population of 38,595. Geraldton is the seat of government for the City of Greater Geraldton , which also incorporates the town of Mullewa , Walkaway and large rural areas previously forming
200-551: A mutually destructive fight with the German auxiliary cruiser Kormoran off Shark Bay in November 1941, with none of the 645 crewmen aboard surviving. A temporary memorial, consisting of a large boulder, a flagpole, and a bronze plaque, was erected in 1998. A permanent memorial was dedicated on 18 November 2001, the day before the 60th anniversary. The HMAS Sydney memorial is made up of four major elements: 1. A stele , based on
300-410: A 673-seat auditorium (including box and circle seating), two large foyers with bars, a reception room, and a 500-seat outdoor amphitheatre. The theatre hosts professional events and performances from around the world. Theatre 8 is an amateur theatre that presents various local talents. The Orana Cinemas in the historical West End is Geraldton's only cineplex with 3D available on selected movies. During
400-433: A density of 11.34 g/cm , which is greater than that of common metals such as iron (7.87 g/cm ), copper (8.93 g/cm ), and zinc (7.14 g/cm ). This density is the origin of the idiom to go over like a lead balloon . Some rarer metals are denser: tungsten and gold are both at 19.3 g/cm , and osmium —the densest metal known—has a density of 22.59 g/cm , almost twice that of lead. Lead
500-492: A few radioactive isotopes. One of them is lead-210; although it has a half-life of only 22.2 years, small quantities occur in nature because lead-210 is produced by a long decay series that starts with uranium-238 (that has been present for billions of years on Earth). Lead-211, −212, and −214 are present in the decay chains of uranium-235, thorium-232, and uranium-238, respectively, so traces of all three of these lead isotopes are found naturally. Minute traces of lead-209 arise from
600-558: A neutron and become thallium-204; this undergoes beta decay to give stable lead-204; on capturing another neutron, it becomes lead-205, which has a half-life of around 17 million years. Further captures result in lead-206, lead-207, and lead-208. On capturing another neutron, lead-208 becomes lead-209, which quickly decays into bismuth-209. On capturing another neutron, bismuth-209 becomes bismuth-210, and this beta decays to polonium-210, which alpha decays to lead-206. The cycle hence ends at lead-206, lead-207, lead-208, and bismuth-209. In
700-466: A polyhedral vertex and contributes two electrons to each covalent bond along an edge from their sp hybrid orbitals, the other two being an external lone pair . They may be made in liquid ammonia via the reduction of lead by sodium . Lead can form multiply-bonded chains , a property it shares with its lighter homologs in the carbon group. Its capacity to do so is much less because the Pb–Pb bond energy
800-533: A regular port of call for cruise ships with visits occurring approximately ten times per year. Volunteers, organised by the City of Greater Geraldton, greet visitors on arrival to provide information on activities and other assistance. The memorial for the World War II cruiser HMAS Sydney is located on Gummer Avenue, at the summit of Mount Scott. The memorial recognises the loss of the light cruiser during
900-437: A significant partial positive charge on lead. The result is a stronger contraction of the lead 6s orbital than is the case for the 6p orbital, making it rather inert in ionic compounds. The inert pair effect is less applicable to compounds in which lead forms covalent bonds with elements of similar electronegativity, such as carbon in organolead compounds. In these, the 6s and 6p orbitals remain similarly sized and sp hybridization
1000-438: A single decay chain). In total, 43 lead isotopes have been synthesized, with mass numbers 178–220. Lead-205 is the most stable radioisotope, with a half-life of around 1.70 × 10 years. The second-most stable is lead-202, which has a half-life of about 52,500 years, longer than any of the natural trace radioisotopes. Bulk lead exposed to moist air forms a protective layer of varying composition. Lead(II) carbonate
1100-452: A structure, with every alternate layer of oxygen atoms absent. Negative oxidation states can occur as Zintl phases , as either free lead anions, as in Ba 2 Pb, with lead formally being lead(−IV), or in oxygen-sensitive ring-shaped or polyhedral cluster ions such as the trigonal bipyramidal Pb 5 ion, where two lead atoms are lead(−I) and three are lead(0). In such anions, each atom is at
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#17327804752581200-590: Is 6 times higher, copper 10 times, and mild steel 15 times higher); it can be strengthened by adding small amounts of copper or antimony . The melting point of lead—at 327.5 °C (621.5 °F) —is very low compared to most metals. Its boiling point of 1749 °C (3180 °F) is the lowest among the carbon-group elements. The electrical resistivity of lead at 20 °C is 192 nanoohm -meters, almost an order of magnitude higher than those of other industrial metals (copper at 15.43 nΩ·m ; gold 20.51 nΩ·m ; and aluminium at 24.15 nΩ·m ). Lead
1300-520: Is a neurotoxin that accumulates in soft tissues and bones. It damages the nervous system and interferes with the function of biological enzymes , causing neurological disorders ranging from behavioral problems to brain damage, and also affects general health, cardiovascular, and renal systems. Lead's toxicity was first documented by ancient Greek and Roman writers, who noted some of the symptoms of lead poisoning , but became widely recognized in Europe in
1400-401: Is a superconductor at temperatures lower than 7.19 K ; this is the highest critical temperature of all type-I superconductors and the third highest of the elemental superconductors. Natural lead consists of four stable isotopes with mass numbers of 204, 206, 207, and 208, and traces of six short-lived radioisotopes with mass numbers 209–214 inclusive. The high number of isotopes
1500-420: Is a common constituent; the sulfate or chloride may also be present in urban or maritime settings. This layer makes bulk lead effectively chemically inert in the air. Finely powdered lead, as with many metals, is pyrophoric , and burns with a bluish-white flame. Fluorine reacts with lead at room temperature, forming lead(II) fluoride . The reaction with chlorine is similar but requires heating, as
1600-457: Is a heritage-listed structure which is visited by photographers, travellers, couples, artists, etc. In 2007, the Geraldton foreshore area, previously an abandoned railway marshalling yard, was redeveloped and today hosts a playground with water activities, public green spaces, public beaches, picnic areas, basketball court and shaded play areas. The project was completed in 2008. Geraldton is
1700-780: Is a mixed sulfide derived from galena; anglesite , PbSO 4 , is a product of galena oxidation; and cerussite or white lead ore, PbCO 3 , is a decomposition product of galena. Arsenic , tin , antimony , silver , gold , copper , bismuth are common impurities in lead minerals. World lead resources exceed two billion tons. Significant deposits are located in Australia, China, Ireland, Mexico, Peru, Portugal, Russia, United States. Global reserves—resources that are economically feasible to extract—totaled 88 million tons in 2016, of which Australia had 35 million, China 17 million, Russia 6.4 million. Typical background concentrations of lead do not exceed 0.1 μg/m in
1800-512: Is a shiny gray with a hint of blue. It tarnishes to a dull gray color when exposed to air. Lead has the highest atomic number of any stable element and three of its isotopes are endpoints of major nuclear decay chains of heavier elements. Lead is a relatively unreactive post-transition metal . Its weak metallic character is illustrated by its amphoteric nature; lead and lead oxides react with acids and bases , and it tends to form covalent bonds . Compounds of lead are usually found in
1900-426: Is a strong oxidizing agent, capable of oxidizing hydrochloric acid to chlorine gas. This is because the expected PbCl 4 that would be produced is unstable and spontaneously decomposes to PbCl 2 and Cl 2 . Analogously to lead monoxide , lead dioxide is capable of forming plumbate anions. Lead disulfide and lead diselenide are only stable at high pressures. Lead tetrafluoride , a yellow crystalline powder,
2000-404: Is a very soft metal with a Mohs hardness of 1.5; it can be scratched with a fingernail. It is quite malleable and somewhat ductile. The bulk modulus of lead—a measure of its ease of compressibility—is 45.8 GPa . In comparison, that of aluminium is 75.2 GPa; copper 137.8 GPa; and mild steel 160–169 GPa. Lead's tensile strength , at 12–17 MPa, is low (that of aluminium
2100-527: Is an endangered Australian Aboriginal language . It is one of the Kartu languages of the Pama–Nyungan family . Wajarri country is inland from Geraldton , and extends as far south and west as Mullewa , north to Gascoyne Junction and east to Meekatharra . The Yamaji Language Centre carried out work on Wajarri throughout the 1990s, producing an illustrated wordlist and various other items. Since July 2005,
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#17327804752582200-445: Is common for the carbon group. The divalent state is rare for carbon and silicon , minor for germanium, important (but not prevailing) for tin, and is the more important of the two oxidation states for lead. This is attributable to relativistic effects , specifically the inert pair effect , which manifests itself when there is a large difference in electronegativity between lead and oxide , halide , or nitride anions, leading to
2300-408: Is consistent with lead's atomic number being even. Lead has a magic number of protons (82), for which the nuclear shell model accurately predicts an especially stable nucleus. Lead-208 has 126 neutrons, another magic number, which may explain why lead-208 is extraordinarily stable. With its high atomic number, lead is the heaviest element whose natural isotopes are regarded as stable; lead-208
2400-414: Is exploited in the synthesis of other lead compounds. Few inorganic lead(IV) compounds are known. They are only formed in highly oxidizing solutions and do not normally exist under standard conditions. Lead(II) oxide gives a mixed oxide on further oxidation, Pb 3 O 4 . It is described as lead(II,IV) oxide , or structurally 2PbO·PbO 2 , and is the best-known mixed valence lead compound. Lead dioxide
2500-522: Is held each August in and around Geraldton and showcases and celebrates innovation and achievement towards sustainability in the Mid West. The Big Sky Readers and Writers Festival – The festival has been hosted by the City of Geraldton and run by The Geraldton Library staff. Australian and International authors come together to share their knowledge and experiences in many ways, from intimate dinners to large scale debates. The St Francis Xavier Cathedral
2600-611: Is home to the Geraldton Yacht Club, which marked its 100th anniversary in 2014. Scuba diving and snorkelling are popular activities around Geraldton. There are several wreck diving sites off the coast, including the South Tomi , which was sunk in 2004. The South Tomi is a 58.7-metre long, 9.81-metre wide vessel that was built by Niigata Engineering and Shipping Co Ltd. in Niigata City, Japan. In March 2001,
2700-556: Is home to the Mid West Academy of Sport, a non-profit community organisation providing support to sporting talent (athletes, coaches, officials and administrators) throughout the Mid West Region of Western Australia. Geraldton is home to a horse racing industry and since 1887 has hosted the annual Geraldton Gold Cup meeting. Queens Park Theatre is the largest entertainment and conference venue in Geraldton, with
2800-502: Is more prevalent than most other elements with atomic numbers greater than 40. Primordial lead—which comprises the isotopes lead-204, lead-206, lead-207, and lead-208—was mostly created as a result of repetitive neutron capture processes occurring in stars. The two main modes of capture are the s- and r-processes . In the s-process (s is for "slow"), captures are separated by years or decades, allowing less stable nuclei to undergo beta decay . A stable thallium-203 nucleus can capture
2900-515: Is not required when fishing from the shore but a licence must be obtained from the Department of Fisheries to fish from a boat. Significant fines apply for non-compliance. Recreational fishing for local Western Rock Lobster is also permitted during the season from December–April (exact dates vary from year to year) however, a special licence is required. Size and daily bag limits apply to certain species of fish and to all lobster catches. The city
3000-650: Is not stable, as both the lead(III) ion and the larger complexes containing it are radicals . The same applies for lead(I), which can be found in such radical species. Numerous mixed lead(II,IV) oxides are known. When PbO 2 is heated in air, it becomes Pb 12 O 19 at 293 °C, Pb 12 O 17 at 351 °C, Pb 3 O 4 at 374 °C, and finally PbO at 605 °C. A further sesquioxide , Pb 2 O 3 , can be obtained at high pressure, along with several non-stoichiometric phases. Many of them show defective fluorite structures in which some oxygen atoms are replaced by vacancies: PbO can be considered as having such
3100-741: Is over three and a half times lower than that of the C–C bond . With itself, lead can build metal–metal bonds of an order up to three. With carbon, lead forms organolead compounds similar to, but generally less stable than, typical organic compounds (due to the Pb–C bond being rather weak). This makes the organometallic chemistry of lead far less wide-ranging than that of tin. Lead predominantly forms organolead(IV) compounds, even when starting with inorganic lead(II) reactants; very few organolead(II) compounds are known. The most well-characterized exceptions are Pb[CH(SiMe 3 ) 2 ] 2 and plumbocene . The lead analog of
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3200-415: Is stable, but less so than the difluoride . Lead tetrachloride (a yellow oil) decomposes at room temperature, lead tetrabromide is less stable still, and the existence of lead tetraiodide is questionable. Some lead compounds exist in formal oxidation states other than +4 or +2. Lead(III) may be obtained, as an intermediate between lead(II) and lead(IV), in larger organolead complexes; this oxidation state
3300-413: Is still energetically favorable. Lead, like carbon, is predominantly tetravalent in such compounds. There is a relatively large difference in the electronegativity of lead(II) at 1.87 and lead(IV) at 2.33. This difference marks the reversal in the trend of increasing stability of the +4 oxidation state going down the carbon group; tin, by comparison, has values of 1.80 in the +2 oxidation state and 1.96 in
3400-445: Is such a contrast. According to Julitha Joan Walker (1931–2009), her first name, Jjulitha, was a Wajarrri word for ' walkabout '. Lead Lead (pronounced "led") is a chemical element ; it has symbol Pb (from Latin plumbum ) and atomic number 82. It is a heavy metal that is denser than most common materials. Lead is soft and malleable , and also has a relatively low melting point . When freshly cut, lead
3500-769: Is the Roman Catholic cathedral of the Diocese of Geraldton . It was designed by the architect and Catholic priest John Hawes . Construction began in 1916 and was completed in 1938. The Cathedral of the Holy Cross is the Anglican cathedral of the North West Anglican Dioceses . It was built during the early 1960s, and "is renowned for having one of the largest areas of stained glass windows in Australia." Wajarri language Wajarri
3600-448: Is the heaviest stable nucleus. (This distinction formerly fell to bismuth , with an atomic number of 83, until its only primordial isotope , bismuth-209, was found in 2003 to decay very slowly.) The four stable isotopes of lead could theoretically undergo alpha decay to isotopes of mercury with a release of energy, but this has not been observed for any of them; their predicted half-lives range from 10 to 10 years (at least 10 times
3700-538: Is the origin of the English word " plumbing ". Its ease of working, its low melting point enabling the easy fabrication of completely waterproof welded joints, and its resistance to corrosion ensured its widespread use in other applications, including pharmaceuticals, roofing, currency, warfare. Writers of the time, such as Cato the Elder , Columella , and Pliny the Elder , recommended lead (and lead-coated) vessels for
3800-525: Is the so-called inert pair effect : the 6s electrons of lead become reluctant to participate in bonding, stabilising the +2 oxidation state and making the distance between nearest atoms in crystalline lead unusually long. Lead's lighter carbon group congeners form stable or metastable allotropes with the tetrahedrally coordinated and covalently bonded diamond cubic structure. The energy levels of their outer s- and p-orbitals are close enough to allow mixing into four hybrid sp orbitals. In lead,
3900-446: Is usefully exploited: lead tetraacetate is an important laboratory reagent for oxidation in organic synthesis. Tetraethyllead, once added to automotive gasoline, was produced in larger quantities than any other organometallic compound, and is still widely used in fuel for small aircraft . Other organolead compounds are less chemically stable. For many organic compounds, a lead analog does not exist. Lead's per-particle abundance in
4000-537: The Old railway station on the corner of Chapman Road and Forrest Street. 4WD access is permitted on many beaches around Geraldton. Many beaches are impassable at times around high tide and during periods of ocean surges. At certain times of year, access may become impossible due to beach erosion . The main beaches in Geraldton are Tarcoola Beach, Back Beach, Separation Point, Point Moore, Pages Beach, Town Beach, Champion Bay, St Georges, Sunset Beach and Bluff Point. During
4100-630: The Phoenicians worked deposits in the Iberian peninsula ; by 1600 BC, lead mining existed in Cyprus , Greece , and Sardinia . Rome's territorial expansion in Europe and across the Mediterranean, and its development of mining, led to it becoming the greatest producer of lead during the classical era , with an estimated annual output peaking at 80,000 tonnes. Like their predecessors,
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4200-671: The Solar System is 0.121 ppb (parts per billion). This figure is two and a half times higher than that of platinum , eight times more than mercury , and seventeen times more than gold . The amount of lead in the universe is slowly increasing as most heavier atoms (all of which are unstable) gradually decay to lead. The abundance of lead in the Solar System since its formation 4.5 billion years ago has increased by about 0.75%. The solar system abundances table shows that lead, despite its relatively high atomic number,
4300-804: The fall of Rome and did not reach comparable levels until the Industrial Revolution . Lead played a crucial role in the development of the printing press , as movable type could be relatively easily cast from lead alloys. In 2014, the annual global production of lead was about ten million tonnes, over half of which was from recycling. Lead's high density, low melting point, ductility and relative inertness to oxidation make it useful. These properties, combined with its relative abundance and low cost, resulted in its extensive use in construction , plumbing , batteries , bullets , shots , weights , solders , pewters , fusible alloys , lead paints , leaded gasoline , and radiation shielding . Lead
4400-401: The nucleus , and more shielded by smaller orbitals. The sum of the first four ionization energies of lead exceeds that of tin, contrary to what periodic trends would predict. This is explained by relativistic effects , which become significant in heavier atoms, which contract s and p orbitals such that lead's 6s electrons have larger binding energies than its 5s electrons. A consequence
4500-499: The $ 5.233 billion in output generated in Mid West Region and 1.19% of the $ 247.705 billion in output generated in Western Australia. The Port of Geraldton is a major west coast port with seven bulk handling berths (and an average loading rate of seven tonnes per hour), ranking nationally (in tonnage for 2012/2013) 12th in exports (14,812,513); 23rd in imports (632,330); and 13th overall (15,444,843). The major exports from
4600-624: The +2 oxidation state rather than the +4 state common with lighter members of the carbon group . Exceptions are mostly limited to organolead compounds . Like the lighter members of the group, lead tends to bond with itself ; it can form chains and polyhedral structures. Since lead is easily extracted from its ores , prehistoric people in the Near East were aware of it . Galena is a principal ore of lead which often bears silver. Interest in silver helped initiate widespread extraction and use of lead in ancient Rome . Lead production declined after
4700-468: The +4 state. Lead(II) compounds are characteristic of the inorganic chemistry of lead. Even strong oxidizing agents like fluorine and chlorine react with lead to give only PbF 2 and PbCl 2 . Lead(II) ions are usually colorless in solution, and partially hydrolyze to form Pb(OH) and finally [Pb 4 (OH) 4 ] (in which the hydroxyl ions act as bridging ligands ), but are not reducing agents as tin(II) ions are. Techniques for identifying
4800-626: The Egyptians had used lead for sinkers in fishing nets , glazes , glasses , enamels , ornaments . Various civilizations of the Fertile Crescent used lead as a writing material , as coins , and as a construction material . Lead was used by the ancient Chinese as a stimulant , as currency , as contraceptive , and in chopsticks . The Indus Valley civilization and the Mesoamericans used it for making amulets ; and
4900-464: The Geraldton coast. The site is registered with the WA Department of Fisheries as a wreck and is closed year round to fishing within the defined boundaries – commencing at 28°43.968'S 114°33.392'E, then east to 114°33.206'E, then north to 28°43.752'S, then east to 114°33.392'E, then south to the commencement point. Water depth at the site is approximately 24.5 metres and the deck is 13 metres from
5000-442: The Geraldton port in 2012/2013 were (tonnage): iron ore (10,741,662); grain (2,618,507); mineral sands (849,933); copper concentrate (149,450); zinc concentrate (148,420); nickel concentrate (65,919); and livestock (2,758). Major imports were petroleum products (328,021). In 2012/2013 the Geraldton port serviced 328 bulk haulage vessels. The Geraldton Visitor Centre is located in the art gallery on 24 Chapman Road. Its former location
5100-537: The Irra Wangga–Geraldton Language Programme has continued work on the Wajarri language, producing publications including a print dictionary and a dictionary app , working with schools involved in the teaching of the language, and holding weekly community language classes (as of 2008 ). In 2008 Wajarri became the first Australian Aboriginal language available at senior secondary level (TEE) in
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#17327804752585200-474: The Murchison-Gascoyne region were instrumental in assisting early settlers in the area in identifying permanent water sources, and worked in the pearling, pastoral and fishing industries. Yamatji art is a distinctive style of painting, using thousands of dots of ochre and other earth-based pigments to create patterns and images relevant to Yamatji/Wajarri culture. The Western Australia Museum at
5300-445: The Murchison-Gascoyne region. Sketch grammars of Wajarri have been written by Douglas (1981) and Marmion (1996). The symbols in brackets show the forms used in the practical orthography employed in the Wajarri dictionary, where these differ from standard IPA symbols. Although Douglas (1981) claimed that there was no laminal contrast (i.e. no phonemic contrast between the dentals and palatals), Marmion (1996) demonstrated that there
5400-594: The Republic of Togo registered South Tomi. The same month, the ship was identified fishing illegally in Australian sub-Antarctic waters and pursued by Australian Fisheries officers for 14 days, covering 3,300 nautical miles (approximately 6,100 kilometres). The vessel was boarded by Australian defence forces 320 nautical miles (approximately 600 km) south of Cape Town in South Africa and inspected. The vessel
5500-475: The Romans obtained lead mostly as a by-product of silver smelting. Lead mining occurred in central Europe , Britain , Balkans , Greece , Anatolia , Hispania , the latter accounting for 40% of world production. Lead tablets were commonly used as a material for letters. Lead coffins, cast in flat sand forms and with interchangeable motifs to suit the faith of the deceased, were used in ancient Judea . Lead
5600-776: The Western Australian coast, passed over the future site of Geraldton on 7 April 1839. George Fletcher Moore , the colony's attorney-general , on the colonial schooner Champion , explored the region in January 1840 and discovered Champion Bay . He was followed by Captain John Clements Wickham and Lieutenant John Lort Stokes of HMS Beagle , who led an expedition to the area in April 1840, and named and surveyed Point Moore and Champion Bay. A decade later, explorer Augustus Gregory travelled through
5700-606: The area around Geraldton. The original local Aboriginal people of Geraldton are the Amangu people, with the Nanda immediately to the north and Badimaya immediately to the east. Today the Aboriginal people of the region generally identify as Yamatji or Wajarri people. Wajarri country is inland from Geraldton and extends as far south and west as Mullewa, north to Gascoyne Junction and east to Meekatharra. The Aboriginal people of
5800-546: The area. A member of his party, James Perry Walcott, discovered lead ore in 1848 in the bed of the Murchison River . The Geraldine mine was subsequently established, named after the County Clare family home of Charles FitzGerald , the 4th Governor of Western Australia . The town of Geraldton, named after Governor FitzGerald, was surveyed in 1850 and land sales began in 1851. During World War II , Geraldton
5900-607: The atmosphere; 100 mg/kg in soil; 4 mg/kg in vegetation, 5 μg/L in fresh water and seawater. The modern English word lead is of Germanic origin; it comes from the Middle English leed and Old English lēad (with the macron above the "e" signifying that the vowel sound of that letter is long). The Old English word is derived from the hypothetical reconstructed Proto-Germanic * lauda- ('lead'). According to linguistic theory, this word bore descendants in multiple Germanic languages of exactly
6000-489: The course of the Earth's history, have remained in the crust instead of sinking deeper into the Earth's interior. This accounts for lead's relatively high crustal abundance of 14 ppm; it is the 36th most abundant element in the crust. The main lead-bearing mineral is galena (PbS), which is mostly found with zinc ores. Most other lead minerals are related to galena in some way; boulangerite , Pb 5 Sb 4 S 11 ,
6100-419: The current age of the universe). Three of the stable isotopes are found in three of the four major decay chains : lead-206, lead-207, and lead-208 are the final decay products of uranium-238 , uranium-235 , and thorium-232 , respectively. These decay chains are called the uranium chain , the actinium chain , and the thorium chain . Their isotopic concentrations in a natural rock sample depends greatly on
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#17327804752586200-428: The diiodide . Many lead(II) pseudohalides are known, such as the cyanide, cyanate, and thiocyanate . Lead(II) forms an extensive variety of halide coordination complexes , such as [PbCl 4 ] , [PbCl 6 ] , and the [Pb 2 Cl 9 ] n chain anion. Lead(II) sulfate is insoluble in water, like the sulfates of other heavy divalent cations . Lead(II) nitrate and lead(II) acetate are very soluble, and this
6300-525: The eastern and southern Africans used lead in wire drawing . Because silver was extensively used as a decorative material and an exchange medium, lead deposits came to be worked in Asia Minor from 3000 BC; later, lead deposits were developed in the Aegean and Laurion . These three regions collectively dominated production of mined lead until c. 1200 BC . Beginning c. 2000 BC,
6400-578: The element its chemical symbol Pb . The word * ɸloud-io- is thought to be the origin of Proto-Germanic * bliwa- (which also means 'lead'), from which stemmed the German Blei . The name of the chemical element is not related to the verb of the same spelling, which is derived from Proto-Germanic * laidijan- ('to lead'). Metallic lead beads dating back to 7000–6500 BC have been found in Asia Minor and may represent
6500-413: The first example of metal smelting . At that time, lead had few (if any) applications due to its softness and dull appearance. The major reason for the spread of lead production was its association with silver, which may be obtained by burning galena (a common lead mineral). The Ancient Egyptians were the first to use lead minerals in cosmetics, an application that spread to Ancient Greece and beyond;
6600-430: The group. Lead dihalides are well-characterized; this includes the diastatide and mixed halides, such as PbFCl. The relative insolubility of the latter forms a useful basis for the gravimetric determination of fluorine. The difluoride was the first solid ionically conducting compound to be discovered (in 1834, by Michael Faraday ). The other dihalides decompose on exposure to ultraviolet or visible light, especially
6700-449: The inert pair effect increases the separation between its s- and p-orbitals, and the gap cannot be overcome by the energy that would be released by extra bonds following hybridization. Rather than having a diamond cubic structure, lead forms metallic bonds in which only the p-electrons are delocalized and shared between the Pb ions. Lead consequently has a face-centered cubic structure like
6800-447: The late 19th century AD. A lead atom has 82 electrons , arranged in an electron configuration of [ Xe ]4f 5d 6s 6p . The sum of lead's first and second ionization energies —the total energy required to remove the two 6p electrons—is close to that of tin , lead's upper neighbor in the carbon group . This is unusual; ionization energies generally fall going down a group, as an element's outer electrons become more distant from
6900-560: The latter being stable only above around 488 °C. Litharge is the most commonly used inorganic compound of lead. There is no lead(II) hydroxide; increasing the pH of solutions of lead(II) salts leads to hydrolysis and condensation. Lead commonly reacts with heavier chalcogens. Lead sulfide is a semiconductor , a photoconductor , and an extremely sensitive infrared radiation detector . The other two chalcogenides, lead selenide and lead telluride , are likewise photoconducting. They are unusual in that their color becomes lighter going down
7000-441: The latter is not; this allows for lead–lead dating . As uranium decays into lead, their relative amounts change; this is the basis for uranium–lead dating . Lead-207 exhibits nuclear magnetic resonance , a property that has been used to study its compounds in solution and solid state, including in the human body. Apart from the stable isotopes, which make up almost all lead that exists naturally, there are trace quantities of
7100-480: The mainland of Australia. The Point Moore lighthouse stands 35m tall and its 1000w Tungsten Halogen Lamp can be seen for 23 nautical miles. It began operation in 1878. The tower was prefabricated in Birmingham, England in 1876 and reached Australia by boat in 1877. However, the foundation for the lighthouse was laid at the wrong place by the local contractors and had to be reconstructed at the new site. Currently, it
7200-540: The marina in Geraldton hosts a permanent exhibit on Yamatji/Wajarri culture and history of the region. Many European mariners encountered, or were wrecked on, the Houtman Abrolhos islands 60 kilometres (37 mi) west of Geraldton during the 17th and 18th centuries. Although two mutineers from the Batavia were marooned on the mainland in 1629 there is no surviving evidence that they made landfall at or near
7300-510: The memorial was recognised by the Australian government as being of national significance. The Geraldton foreshore area has pathways for walking, running, cycling, dog-walking, skateboarding and in-line skating. There are skate parks at Cape Burney, Maitland Park, Wonthella, Strathalbyn, Tarcoola Beach, Forrester and Drummond Cove. Farmers markets occur on Saturday from 8 am to 12 noon in Maitland Park on Cathedral Avenue and on Sunday at
7400-539: The neutrons are arranged in complete shells in the atomic nucleus, and it becomes harder to energetically accommodate more of them. When the neutron flux subsides, these nuclei beta decay into stable isotopes of osmium , iridium , platinum . Lead is classified as a chalcophile under the Goldschmidt classification , meaning it is generally found combined with sulfur. It rarely occurs in its native , metallic form. Many lead minerals are relatively light and, over
7500-445: The north. In winter, local weather conditions shift to predominantly easterly (offshore) winds. Indian Ocean storms generate large swells that produce good conditions for surfing (though the fringe barrier reef protecting the Geraldton coastline blocks much of the swell, significantly reducing the size of the waves that reach the beaches). Large swells may create potentially dangerous rip currents as water flows through passages between
7600-588: The notes of Francois Pelsaert , the commander of the Batavia when she ran aground. The Western Australian Museum in Geraldton houses an exhibition of clay pipes, silver coins, cannons, the original Batavia stone portico and numerous other relics recovered from the wreck of the Batavia and other notable local historical shipwrecks such as the Zuytdorp , Zeewijk and Vergulde Draeck . The explorer George Grey , while on his second disastrous expedition along
7700-418: The preparation of sweeteners and preservatives added to wine and food. The lead conferred an agreeable taste due to the formation of "sugar of lead" ( lead(II) acetate ), whereas copper vessels imparted a bitter flavor through verdigris formation. This metal was by far the most used material in classical antiquity, and it is appropriate to refer to the (Roman) Lead Age. Lead was to the Romans what plastic
7800-414: The presence of the Pb ion in water generally rely on the precipitation of lead(II) chloride using dilute hydrochloric acid. As the chloride salt is sparingly soluble in water, in very dilute solutions the precipitation of lead(II) sulfide is instead achieved by bubbling hydrogen sulfide through the solution. Lead monoxide exists in two polymorphs , litharge α-PbO (red) and massicot β-PbO (yellow),
7900-422: The presence of these three parent uranium and thorium isotopes. For example, the relative abundance of lead-208 can range from 52% in normal samples to 90% in thorium ores; for this reason, the standard atomic weight of lead is given to only one decimal place. As time passes, the ratio of lead-206 and lead-207 to lead-204 increases, since the former two are supplemented by radioactive decay of heavier elements while
8000-506: The previous record of 47.7 °C (117.9 °F) set on 9 January 1954. Weather Atlas (sun hours) As of the 2021 census , the population of the Geraldton urban area was 38,595, and in urban Geraldton: The economic output generated within Greater Geraldton, the 12,626-square-kilometre (4,875 sq mi) local government area incorporating Geraldton, is estimated at $ 2.944 billion. Greater Geraldton represents 56.26% of
8100-432: The r-process (r is for "rapid"), captures happen faster than nuclei can decay. This occurs in environments with a high neutron density, such as a supernova or the merger of two neutron stars . The neutron flux involved may be on the order of 10 neutrons per square centimeter per second. The r-process does not form as much lead as the s-process. It tends to stop once neutron-rich nuclei reach 126 neutrons. At this point,
8200-548: The reef. Saltwater fishing , boating and sailing are popular along Geraldton's coastline. Local and visiting recreational fishermen and women target a wide variety of native sport fish from the beaches and wharves that includes Mulloway, Bream, Tailor, Whiting, Sharks and Cod; larger fish such as Dhufish, Mackerel, Tuna, Snapper, Sampsonfish, Coral Trout and larger sharks, amongst many others are found on Geraldton's offshore reefs, located from approximately 8 km to more than 80 km offshore. A recreational fishing licence
8300-541: The resulting chloride layer diminishes the reactivity of the elements. Molten lead reacts with the chalcogens to give lead(II) chalcogenides. Lead metal resists sulfuric and phosphoric acid but not hydrochloric or nitric acid ; the outcome depends on insolubility and subsequent passivation of the product salt. Organic acids, such as acetic acid , dissolve lead in the presence of oxygen. Concentrated alkalis dissolve lead and form plumbites . Lead shows two main oxidation states: +4 and +2. The tetravalent state
8400-518: The same meaning. There is no consensus on the origin of the Proto-Germanic * lauda- . One hypothesis suggests it is derived from Proto-Indo-European * lAudh- ('lead'; capitalization of the vowel is equivalent to the macron). Another hypothesis suggests it is borrowed from Proto-Celtic * ɸloud-io- ('lead'). This word is related to the Latin plumbum , which gave
8500-462: The ships prow; 2. A granite wall listing the ships company; 3. A bronze statue of a woman looking out to sea and waiting in vain for Sydney to return; and 4. A dome made up of 645 stainless steel seagulls. The 645 stainless steel seagulls represent the souls of the lost sailors. In Folklore, birds such as seagulls are sometimes known as 'soul birds' because they are regarded as the souls of people who died at sea. (Armstrong, 1958) Sydney In May 2009,
8600-408: The shires of Greenough and Mullewa . The Port of Geraldton is a major west coast seaport. Geraldton is an important service and logistics centre for regional mining, fishing, wheat, sheep and tourism industries. Clear evidence has established Aboriginal people living on the west coast of Australia for at least 40,000 years, though at present it is unclear when the first Aboriginal people reached
8700-491: The similarly sized divalent metals calcium and strontium . Pure lead has a bright, shiny gray appearance with a hint of blue. It tarnishes on contact with moist air and takes on a dull appearance, the hue of which depends on the prevailing conditions. Characteristic properties of lead include high density , malleability, ductility, and high resistance to corrosion due to passivation . Lead's close-packed face-centered cubic structure and high atomic weight result in
8800-588: The simplest organic compound , methane , is plumbane . Plumbane may be obtained in a reaction between metallic lead and atomic hydrogen. Two simple derivatives, tetramethyllead and tetraethyllead , are the best-known organolead compounds. These compounds are relatively stable: tetraethyllead only starts to decompose if heated or if exposed to sunlight or ultraviolet light. With sodium metal, lead readily forms an equimolar alloy that reacts with alkyl halides to form organometallic compounds such as tetraethyllead. The oxidizing nature of many organolead compounds
8900-599: The site of the current town. The wreck of the Batavia , flagship of the Dutch East India Company (VOC) fleet on her maiden voyage, on Morning Reef of the Houtman Abrolhos on 4 June 1629, and the events surrounding the subsequent mutiny, rescue and punishment of her crew are of great historical significance to the region. A detailed account of the events is recorded in a 24 December 1897 Western Mail article "The Abrolhos Tragedy", translated from
9000-418: The spring, summer and early autumn months from September through April, Geraldton experiences consistent seabreezes. Windsurfing and kitesurfing locations include Back Beach, Separation Point ("Seppos"), Point Moore, Hell's Gate, St. George’s and Sunset Beach. The region is a popular windsurfing location, attracting significant numbers of overseas visitors and product testing by manufacturers. In 2005, Geraldton
9100-426: The state of Western Australia . People who are Wajarri speakers, or who are descended primarily from Wajarri speakers, also refer to themselves as Wajarri (Wajari). The word for 'man' in Wajarri is yamatji ( yamaji ), and this word is also commonly used by Wajarri people to refer to themselves. Depending on the context, yamaji may also be used to refer to other Aboriginal people, particularly people from
9200-822: The summer months (measured at 10m) are consistently above 22C, often exceeding 24C. Surface sea temperatures in summer regularly exceed 26C. In the winter the temperature is mild with daily highs averaging around 20 °C (68 °F). Most of the yearly rainfall falls in this period. In the summer months, Geraldton averages 32–33 °C (90–91 °F), with some days over 40 °C (104 °F). Afternoon sea breezes cool coastal areas and summer temperatures in coastal suburbs of Geraldton (Seacrest, Tarcoola, Geraldton CBD, Beresford, Sunset Beach, Bluff Point and Drummond Cove) are generally cooler than in inland suburbs, such as Strathalbyn, Utakarra, Woorree, Deepdale and Moonyoonooka. On 18 February 2024, Geraldton recorded its highest ever temperature of 49.3 °C (120.7 °F), breaking
9300-510: The summer months, a movie is sometimes shown at the side of Dome on Foreshore Drive by Sun City Cinema. The Geraldton Sunshine Festival, established in 1958, is one of Australia's longest-running festivals. The festival takes place annually in October, celebrating the arrival of Spring and providing opportunities for residents and visitors to engage with local businesses and other organisations. The Goodness Sustainability and Innovation Festival
9400-714: The surface. The wreck of the South Tomi provides an easily accessible diving alternative to the nearby Houtman Abrolhos . Geraldton has a number of resident sporting teams, including Australian Rules Football, Basketball, Netball, Soccer and Roller Derby League. The men's basketball team, the Geraldton Buccaneers of the NBL1 West , has been described as the "pride of the city". They play at Activewest Stadium on Eighth Street, where most home games are sold out to capacity with upwards of 2,000 people. Geraldton
9500-403: The very rare cluster decay of radium-223, one of the daughter products of natural uranium-235, and the decay chain of neptunium-237, traces of which are produced by neutron capture in uranium ores. Lead-213 also occurs in the decay chain of neptunium-237. Lead-210 is particularly useful for helping to identify the ages of samples by measuring its ratio to lead-206 (both isotopes are present in
9600-546: Was found to be carrying an illegal catch of protected Patagonian toothfish and the vessel and its catch were confiscated by Australian authorities. The vessel was escorted 8,500 km to Western Australia and arrived on 5 May in Fremantle. The catch was sold by the Australian government for $ 1.4 million. The City of Geraldton secured the vessel to be sunk as an artificial reef. The ship was towed from Fremantle to Geraldton and scuttled on 18 September 2004 2.9 nautical miles off
9700-502: Was host to the Australian KiteSurfing Association (AKSA) Australian National Championships. Surfing , and more recently Stand up paddle surfing , are also popular activities in and around Geraldton. Popular surf spots include Flat Rocks, Greenough, Back Beach, Sunset Beach and Glenfield. Stand-Up Paddlesurfing spots include Point Moore, Town Beach, The Foreshore, St. Georges Beach and Drummond Cove to
9800-491: Was the location of No. 4 Service Flying Training School RAAF . This flying school was formed on 10 February 1941 and disbanded in May 1945. Geraldton has a Mediterranean climate ( Csa ) with semi-arid ( Bsk ) influence. Geraldton is very sunny, receiving around 164 clear days annually. Summers are long lasting and hot, though with relatively mild nights. Winters are short but mild and wet with cool nights. Mean sea temperatures in
9900-499: Was the original Railway Station, a historic building in Geraldton's West End, and was originally built in 1878. It was the first railway station constructed on a Government line in Western Australia. The Point Moore Lighthouse, located south of the Geraldton Port is a cultural and historical attraction. It is the oldest surviving Commonwealth lighthouse in Western Australia and was also the first steel tower to be constructed on
10000-534: Was used to make sling bullets from the 5th century BC. In Roman times, lead sling bullets were amply used, and were effective at a distance of between 100 and 150 meters. The Balearic slingers , used as mercenaries in Carthaginian and Roman armies, were famous for their shooting distance and accuracy. Lead was used for making water pipes in the Roman Empire ; the Latin word for the metal, plumbum ,
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