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I am a silvery metal that is as resistant to corrosion and tarnishing as gold I am almost as rare and consequently am the likewise highly valued and used in Jewelry I am also used in chemicals industry as a catalyst in medicine as an anti-cancer drug and in catalytic converters for car exhausts I have an atomic number ok 78 my atomic weight is 19509 when rounded 195 and a symbol of Pt Who am I Im platinum of coarse Platinum is a member of the six transition elements in Group VIII of the periodic table known collectively as the platinum metals ruthenium rhodium palladium osmium iridium and platinum The name is derived from the Spanish platina meaning silver The element was discovered in South America independently by Antonio de Ulloa in 1735 and by N Wood in 1741 but it had been in use by pre-Columbian Indians The platinum metals are extremely rare elements platinum itself is the most common with an abundance in the Earths crust of about a millionth of 1 percent whereas the others of the group have abundances of about one ten-millionth of 1 percent Platinum occurs in nature as the pure metal and also in alloys with other metals of the group principally in the alluvial deposits of the Ural Mountains of Columbia and of some parts of the western United States In addition the element occurs in the mineral sperrylite and in the nickel-bearing deposits of Ontario in Canada The large-scale production of nickel makes it feasible to recover the small amounts of platinum only 1 part of platinum to 2 million parts of ore The recovery of the individual platinum metals from the natural alloys is a complex process that depends upon the distinct properties of the individual elements even though all members of the group are generally similar in their chemical behavior and are quite unreactive For example when the natural alloy of
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