Iridium
Symbol
Ir
Atomic Number
77
Atomic Weight
192.22
Element Classification
Discovered By
S.Tenant, A.F.Fourcory, L.N.Vauquelin, H.V.Collet-Descoltils
Discovery Date
1804 (England/France)
Name Origin
Latin: iris (rainbow).
Density (g/cc)
22.42
Melting Point (K)
2683
Boiling Point (K)
4403
Appearance
White, brittle metal
Atomic Radius (pm)
136
Atomic Volume (cc/mol)
8.54
Covalent Radius (pm)
127
Ionic Radius
68 (+4e)
Specific Heat
0.133
Fusion Heat (kJ/mol)
27.61
Evaporation Heat (kJ/mol)
604
Thermal Conductivity (@25°C W/m K)
147
Debye Temperature (K)
430.00
Pauling Negativity Number
2.20
First Ionizing Energy (kJ/mol)
868.1
Oxidation States
6, 4, 3, 2, 1, 0, -1
Electronic Configuration
[Xe] 4f14 5d7 6s2
Lattice Structure
Face-Centered Cubic(FCC)
Lattice Constant
3.840
Lattice C/A Ratio
n/a
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