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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 very hard, usually brittle, extremely corrosion-resistant silver-white metal with a face-centered cubic crystalline structure. It falls between platinum and osmiu â¦ m in Group 9 of the periodic table. It is not certain whether osmium or iridium is the most dense element. The Element Iridium in Chemistry The element iridium is a platinum group metal that is a very durable, hard, and lustrous metal and is similar to platinum. 2  It is well known for being the most corrosive and râ¦.