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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.
Iridium is a chemical element with symbol Ir and atomic number 77.  It is a very hard, brittle, silvery-white transition metal of the  platinum family.2 people found this useful. Edit.ridium was discovered in 1803 among insoluble impurities in natural platinum. Smithson Tennant, the primary discoverer, named the iridium for the goddess Iris, personificatio â¦ n of the rainbow, because of the striking and diverse colors of its salts.