Atomic Number 77     Atomic Mass 192.22     Density 22.421 g/mL

State solid     Color silvery white     Electronegativity 2.28

Melting Point 2410°C     Boiling Point 4130°C

Natural Isotopes Ir-191 37.3%      Ir-193 62.7%

Abbreviated Electron Configuration [Xe] 4f¹⁴ 5d⁷ 6s²

Discovered by Smithson Tennant in 1804.