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Platinum is a chemical element; it has symbol Pt and atomic number 78. It is a dense, malleable, ductile, highly unreactive, precious, silverish-white transition metal. Its name originates from Spanish platina, a diminutive of plata "silver". [7] [8] Platinum is a member of the platinum group of elements and group 10 of the periodic table of ...
This metal would later be identified as a new chemical element, now known as platinum. [2] Ulloa is therefore often credited as the discoverer of platinum. [3] [4] Map by Jorge Juan and Antonio de Ulloa of the triangulation carried out between Quito and Cuenca by the French Geodesic Mission to the Equator, in 1735–1744.
Nikolay Nikolayevich Semyonov ForMemRS, sometimes Semenov, Semionov or Semenoff [1] (Russian: Никола́й Никола́евич Семёнов; 15 April [O.S. 3 April] 1896 – 25 September 1986) was a Soviet physicist and chemist.
Perey discovered it as a decay product of 227 Ac. [177] Francium was the last element to be discovered in nature, rather than synthesized in the lab, although four of the "synthetic" elements that were discovered later (plutonium, neptunium, astatine, and promethium) were eventually found in trace amounts in nature as well. [178]
Chemical analysis related to the process of purifying platinum led Wollaston to discover the elements palladium (symbol Pd) in 1802 and rhodium (symbol Rh) in 1804. [1] When Anders Gustav Ekeberg discovered tantalum in 1802 Wollaston declared the new element identical with niobium (then known as columbium).
The other metals discovered before the Scientific Revolution largely fit the pattern, except for high-melting platinum: Bismuth melts at 272 °C (521 °F) [21] Zinc melts at 420 °C (787 °F), [21] but importantly boils at 907 °C (1665 °F), a temperature below the melting point of silver. Consequently, at the temperatures needed to reduce ...
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Within three days they succeeded in determining platinum in a pyroxenite and associated ultrabasic rocks on the farms Mooihoek and Maandagshoek. [9] By early September 1924 they had discovered the famous Merensky Reef, tracing it over many kilometers whilst procuring the necessary surface area mining rights and options for the L.P. Syndicate ...