Cobalt

Cobalt, Co, is a light gray transition metal element, found in Group VIII of the periodic table.

Atomic Number : 27
Relative Atomic Mass : 58.933
Melting Point : 1495 degC
Melting Point : 2870 degC

Discovery

Cobalt was discovered by G Brandt in 1737AD.

Occurrence

Cobalt is often associated with other elements in their ores, particularly nickel, silver, lead, copper and iron.
Cobalt occurs in Cobaltite, Smaltite, and Erythrite.
Cobalt occurs in meteorites.

Extraction

Preparation

Manufacture

Properties

Cobalt is a brittle hard metal.

Cobalt occurs in two oxidation states in its salts.

Reactions

Uses

Cobalt is used in

electroplating to give a hard surface which is resistant to oxidation,
is used to give a blue colour in pottery enamels and glass,
is used in Alnico alloy, a material with high magnetic strength,
in Stellite alloy for high speed cutting tools, and
in animal medicine to correct for its deficiency in soils.
Cobalt-60, a radioactive isotopes is used as a gamma ray source.

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