Platinum.7z — Portable

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Platinum has six naturally occurring isotopes: Pt-190 (0.01%), Pt-192 (0.79%), Pt-194 (32.9%), Pt-195 (33.8%), Pt-196 (25.2%), and Pt-198 (7.2%). Pt-190 is radioactive with an extremely long half-life of 6.5×10¹¹ years. Platinum is found in native form (pure or alloyed with other PGMs) and in ores such as sperrylite (PtAs₂) and cooperite (PtS). Most platinum is recovered as a by-product of nickel and copper mining. platinum.7z

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Platinum is the material of choice for analytical chemistry crucibles, electrodes (e.g., for conductivity measurement), and the international standard for resistance thermometry (the platinum resistance thermometer, PRT). The International Prototype Kilogram (retired 2019) was a platinum-iridium cylinder. Platinum is found in native form (pure or

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