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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.
ir - Computer Definition. A silver-white metallic element, iridium has 77 electrons around its nucleus and, therefore, is number 77 in the Periodic Table of Elements.