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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.
a chemical element, atomic number 77, atomic weight 192.2. iÂ·ridÂ·iÂ·um (Ir), A white, silvery metallic element, atomic no. 77, atomic wt. 192.22; 192Ir is a radioisotope (half-life of 73.83 days) that has been used in the interstitial treatment of certain tumors. iridium. /iridÂ·iÂ·um/ (Ir) (Ä­-ridÂ´e-um) chemical element, at. no. 77. iridium Ir 192 an artificial radioactive isotope with a half-life of 75 days, used in radiotherapy.