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Iridium is a stable metal that chemically unreactive, like platinum and gold. Iridium is the most resistant to oxidation of all metals. It can be used is as a hardening agent in alloys with Platinum and Osmium. Sometimes used in medical therapies e.g. treating prostate cancer by radiation therapy.
Discovery of Iridium. Iridium was discovered in 1803, by English chemist Smithson Tennant in London. He found it in the residue left when crude platinum had been dissolved in aqua regia (a mixture of hydrochloric acid and nitric acid). Smithson Tennant also discovered osmium at the same time.ource: Iridium is found in natural alloys with platinum and osmium in alluvial deposits. Commercially, iridium is recovered as a by-product from the nickel mining industry. Isotopes: Iridium has 34 isotopes whose half-lives are known, with mass numbers from 165 to 198.