Name :  Iridium
Symbol :  Ir
Atomic Number :  77
Atomic Weight :  192.22
Specific Heat :  0.130 J/gK
Melting Point :  2410°C
Vaporization :  604.0 kJ/mol
Boiling Point :  4130°C
Electronegativity :  2.2
Density@293 K :  22.42 g/cm³
Discovered :  S.Tenant, A.F.Fourcory, L.N.Vauquelin, H.V.Collet-Descoltils, England/France, 1804
Description :  Heavy, brittle, white metal.
Uses :  Used with osmium to tip gold pen points, to make crucible and special containers. Also to make alloys used for standard weights and measures, and heat-resistant alloys. Also as hardening agent for platinum.