Cobalt
Symbol
Co
Atomic Number
27
Atomic Weight
58.9332
Element Classification
Discovered By
George Brandt
Discovery Date
1739 (Sweden)
Name Origin
German: kobold (goblin).
Density (g/cc)
8.9
Melting Point (K)
1768
Boiling Point (K)
3143
Appearance
Hard, ductile, lustrous bluish-gray metal
Atomic Radius (pm)
125
Atomic Volume (cc/mol)
6.7
Covalent Radius (pm)
116
Ionic Radius
63 (+3e) 72 (+2e)
Specific Heat
0.456
Fusion Heat (kJ/mol)
15.48
Evaporation Heat (kJ/mol)
389.1
Thermal Conductivity (@25°C W/m K)
100
Debye Temperature (K)
385.00
Pauling Negativity Number
1.88
First Ionizing Energy (kJ/mol)
758.1
Oxidation States
3, 2, 0, -1
Electronic Configuration
[Ar] 3d7 4s2
Lattice Structure
Hexagonal(HEX)
Lattice Constant
2.510
Lattice C/A Ratio
n/a
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