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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.
Group 18 in the periodic table is the last column on the periodic table.This family is known as the Noble Gases and is so special because of their inability to react. They have a full outer shell of electrons, which means they are very stable and can be found in nature as isolated elements. 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¦. 3  The Periodic Table of Elements Life is sustained by a number of chemical elements.