IRIDIUM

The iridium is a chemical element of atomic number 77 that places in the group 9 of the periodic table. His symbol is To go. It was discovered in 1803 by the chemical Englishman Smithson Tennant. It is a question of a metal of transition, of the group of the platinum, hard, fragile, heavy, of white silver color. It comes from Iridium. It uses in alloys of high resistance that can support high temperatures.
It is a slightly abundant element and meets in the nature in alloys platinum and osmium. It is the element most resistant to the corrosion. It uses in electrical contacts, devices that work to high temperatures, and as agent stiffener of the platinum. The iridium in free condition is a metallic white and hard substance. The iridium has minor resistance great to the oxidation. The iridium is the appropriate name, for his you go out they are very colored.
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