Cobalt

Common Uses

Spring Alloys: When the cobalt based spring alloys were developed they had the best resistance of any material to relaxation at high temperatures. These are used for diaphragms, bearings, rupture discs and instrument springs. Cobalt-Chrome
Cobalt Blue Glass obtains its deep blue color from cobalt. Cobalt-Chrome
Raw Cobalt Cobalt-Chrome

General Properties
Atomic Symbol Co
Atomic Weight 58.9332 g/mol
Element Number 27
Standard State Solid
Date of Discovery 1735
Discoverer Brandt
Physical Properties
Oxidation States 2, 3
Boiling Point 3200 K
Melting Point 1768 K
Density 8.86 g/cm³
Electron Configuration [Ar]3d7,4s2
Crystal Structure Hexagonal close packed
Electronegativity 1.88
Heat of Vaporization 382 kJ/mol
Heat of Fusion 16.3 kJ/mol
Thermal Conductivity 100 Wm-¹K-¹ (at 300 K)
Specific Heat Capacity 0.421 Jg-¹K-¹ (at 300 K)
First Ionization Potential 7.88
Atomic Volume 6.62 cm³/mol
Atomic Radius 1.25 Å
Synthetic No