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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:   The above text is excerpted from the Wikipedia article "Iridium", which has been released under the GNU Free Documentation License.
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