Osmium
Symbol
Os
Atomic Number
76
Atomic Weight
190.23
Element Classification
Discovered By
Smithson Tenant
Discovery Date
1804 (England)
Name Origin
Greek: osme (odor).
Density (g/cc)
22.57
Melting Point (K)
3327
Boiling Point (K)
5300
Appearance
Blue-white, lustrous, hard metal
Atomic Radius (pm)
135
Atomic Volume (cc/mol)
8.43
Covalent Radius (pm)
126
Ionic Radius
69 (+6e) 88 (+4e)
Specific Heat
0.131
Fusion Heat (kJ/mol)
31.7
Evaporation Heat (kJ/mol)
738
Thermal Conductivity (@25°C W/m K)
(87.6)
Debye Temperature (K)
n/a
Pauling Negativity Number
2.2
First Ionizing Energy (kJ/mol)
819.8
Oxidation States
8, 6, 4, 3, 2, 0, -2
Electronic Configuration
[Xe] 4f14 5d6 6s2
Lattice Structure
Hexagonal(HEX)
Lattice Constant
2.740
Lattice C/A Ratio
1.579
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