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It is a dense, malleable, ductile, highly unreactive, precious, silverish-white transition metal. Its name originates from Spanish platina, a diminutive of plata "little silver". [ 6 ][ 7 ] Platinum is a member of the platinum group of elements and group 10 of the periodic table of elements.
Naturally occurring platinum and platinum-rich alloys were known by pre-Columbian Americans for many years. [5] However, even though the metal was used by pre-Columbian peoples, the first European reference to platinum appears in 1557 in the writings of the Italian humanist Julius Caesar Scaliger (1484–1558) as a description of a mysterious metal found in Central American mines between ...
Platinum price 1970-2022 Platinum price 1880–2011 Platinum price 1968–2012. Platinum is traded as an ETF (exchange-traded fund) on the London Stock Exchange under the ticker symbol LSE: PHPT and on the New York Stock Exchange as ticker symbols PPLT and PLTM [13] There are also several ETNs (exchange-traded note) available, [14] some of which are inverse to the price of platinum.
Gold nuggetA selection of precious metal elements; gold, silver, platinum, palladium, copper, ruthenium, rhodium, rhenium, osmium, iridiumand mercury. They are labeled and arranged by their location on the periodic table. Precious metalsare rare, naturally occurring metallicchemical elementsof high economic value.
Platinum–iridium alloy. The international prototype of the kilogram (IPK) is an artifact standard of platinum–iridium alloy that was defined as having a mass of exactly one kilogram. Platinum–iridium alloys are alloys of the platinum group precious metals platinum and iridium. Typical alloy proportions are 90:10 or 70:30 (Pt:Ir).
Platinum coin. Common obverse of the American Eagle coins. Platinum coins are a form of currency. Platinum has an international currency symbol under ISO 4217 of XPT. The issues of legitimate platinum coins were initiated by Spain in Spanish-colonized America in the 18th century and continued by the Russian Empire in the 19th century. As a form ...
The metal workers involved heated gold with grains of the platinum alloy until the gold melted. After cooling, the resulting conglomeration was hammered and reheated repeatedly until it became homogenous, equivalent to melting all the metals (attaining the melting points of the platinum group metals concerned was beyond the technology of the day).
Standard atomic weight Ar° (Pt) Naturally occurring platinum (78 Pt) consists of five stable isotopes (192 Pt, 194 Pt, 195 Pt, 196 Pt, 198 Pt) and one very long-lived (half-life 4.83×10 11 years) radioisotope (190 Pt). There are also 34 known synthetic radioisotopes, the longest-lived of which is 193 Pt with a half-life of 50 years.
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