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Cobalt (Co) is a hard, lustrous, gray transition metal used since 1400 BC.Georg Brandt (1694-1768) isolated the element from copper ore but his work was not initially recognized. Cobalt-based blue pigments (cobalt blue) have been used since ancient times for jewelry and paints, and to give a distinctive blue tint to glass. Also cobalt is primarily used as the metal, in the preparation of magnetic, wear-resistant and high-strength alloys.

The name cobalt comes from the word evil - miners would get sick due to poisonous arsenic-containing fumes upon smelting.

Name Cobalt
Atomic Number 27
Atomic Weight 58.9332
Symbol Co
Melting Point ( °C ) 1,493°C
Boiling Point ( °C ) 3,100°C
Density (g/cm3) 8.9
Earth crust (%) 0.003%
Discovery (Year) Georg Brandt (1732)
Group 9
Electron configuration [Ar] 3d7 4s2
Ionization energy (eV) 7,881