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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.
Rubidium vapor is used in laser cooling systems. Rubidium has an atomic number of 37, and it is identified as Rb on the periodic table. Rubidium was discovered in the nineteenth century with the help of a spectroscope.ubidium vapor is used in laser cooling systems. Rubidium has an atomic number of 37, and it is identified as Rb on the periodic table. Rubidium was discovered in the nineteenth century with the help of a spectroscope.