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
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
31.7
Evaporation Heat(kj/mol)
738
Thermal Conductivity(@25°C W/m K)
(87.6)
Debye Temperature
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
