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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 "Thenard’s 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 Earth’s crust.
Click on an item to paste into clipboard or use clipboard symbol at end to clipboard all values | Atomic number | 27 | | Clip | | Atomic / Molecular Weight | 58.9332 | gmol-1 | Clip | | Density | 8800 | kgm-3 | Clip | | Crystal Structure | hcp / fcc at 690K | | Clip | | Lattice constant | 251 | fm | Clip | | Melting Point | 1768 | K | Clip | | Boiling Point | 3173 | K | Clip | | Tensile strength | 500000000 | Nm-2 | Clip | | Linear expansivity | 0.000012 | K-1 | Clip | | Specific heat capacity | 435 | Jkg-1K-1 | Clip | | Latent heat of fusion | 243000 | Jkg-1 | Clip | | Thermal conductivity | 105 | Wm-1K-1 | Clip | | Electromotive Series | 0.28 | V | Clip |
 paste all data into clipboard See also: Cobalt II Bromide, Cobalt II Chloride, Cobalt II Nitrate, Cobalt II Oxide, Cobalt III Oxide, Ferromagnetism, Periodic Table.
  
Subjects:- Chemistry
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