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Iridium

Iridium is a chemical element in the periodic table that has the symbol Ir and atomic number 77.

A dense, very hard, brittle, silvery-white transition metal of the platinum family, iridium is used in high strength alloys that can withstand high temperatures and occurs in natural alloys with platinum or osmium.

Iridium is notable for being the most corrosion resistant element known and for its association with the demise of the dinosaurs.

Note: This article excerpts material from the Wikipedia article "Iridium", which is released under the GNU Free Documentation License.

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