Cobalt

Cobalt is a hard, grey metal which is ferromagnetic. It is usually found in association with nickel in arsenical ores. Cobalt is relatively unreactive, being stable in airand only slowly attacked by dilute acids. It does not combine with hydrogen and nitrogen but it does react with carbon, oxygen and steam at elevated temperatures, producing CoO in the latter cases. Cobalt salts (primarily cobalt aluminate, known as "Cobalt Blue", or "Thenardís Blue") have been known of and used for centuries to provide a blue colouration to paints and ceramics. Cobalt alloys have good thermal and oxidation resistance, coupled with mechanical strength. The metal is also used in electroplating and its radioactive isotope, 60Cobalt, is used in the treatment of cancer.


Symbol
Co

Discovered
1735 by G. Brandt in Stockholm, Sweden.

Abundance
20 ppm of the Earthís crust.

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Atomic number 27 Clip
Atomic / Molecular Weight 58.9332 gmol-1Clip
Density 8800 kgm-3Clip
Crystal Structure hcp / fcc at 690K Clip
Lattice constant 251 fmClip
Melting Point 1768 KClip
Boiling Point 3173 KClip
Tensile strength 500000000 Nm-2Clip
Linear expansivity 0.000012 K-1Clip
Specific heat capacity 435 Jkg-1K-1Clip
Latent heat of fusion 243000 Jkg-1Clip
Thermal conductivity 105 Wm-1K-1Clip
Electromotive Series 0.28 VClip
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See also: Cobalt II Bromide, Cobalt II Chloride, Cobalt II Nitrate, Cobalt II Oxide, Cobalt III Oxide, Ferromagnetism, Periodic Table.

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Subjects: Chemistry