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Atomic Number: 77
Ir
Ir

Iridium

192.2200 u

Category

transition metal

State at Room Temperature

solid

Electron Configuration

1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 6s² 4f¹⁴ 5d⁷

Valence Electrons

2

Lewis Dot:••

Electronegativity

2.2

Pauling scale

Oxidation States

+3+4

Melting Point

2719 K

2445.85°C

Boiling Point

4403 K

4129.85°C

Density

22.56

g/cm³

Position in Table

Group 9Period 6d-block

Discovery

Historical Information

Discovered bySmithson Tennant
Year1803

Common Uses

Applications & Industries

Spark plugs, crucibles, electrical contacts, cancer treatment

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