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What is Ir?
Iridium Atomic Number: 77 Symbol: Ir Atomic Weight: 192.22 Element Classification: Transition Metal The metal is used for hardening platinum. It is used in crucibles an…d other applications requiring high temperatures. Iridium is combined with osmium to form an alloy used in compass bearings and for tipping pens. Iridium is also used for electrical contacts and in the jewelry industry. IR: Injured Reserve (MORE)