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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.
Who Discovered Rubidium. 02 Mar, 2012 Who discovered 0. Rubidium is a very soft, and highly reactive, silvery white metal. It is a chemical element with an atomic mass of 85.4678 and is represented by the chemical symbol Rb and the atomic number 37. It is the 23rd most common element in the crust of the Earth, but it is not widely mined because it has limited uses.