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Definition of "Iridium" |
Iridium is the chemical element with symbol Ir and atomic number 77. A very hard, brittle, silvery-white transition metal of the platinum family, iridium is generally credited with being the second densest element (after osmium) based on measured density, although calculations involving the space lattices of the elements show that iridium is denser, and is the most corrosion-resistant metal, even at temperatures as high as 2000 °C. |
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