Home 27 Co Cobalt back to the periodic table

Atomic number   27
Symbol   Co
Atomic weight   58.93320
Density [g/cm3]   8.89
Melting point [°C]   1495
Boiling point [°C]   2870
1st Ionization energy [eV]   7.86
Electronic configuration   [Ar] 3d7 4s2
Oxidation number (most stable)   3, 2, 0, 1-
Atomic radius [pm]   125.3
Ionic radius [pm]   65 (2+)
Abundance in crustal rocks [ppm]   29
Origin of the name   from the German Kobald meaning goblin or evil spirit
Discovery   1735 by the Swedish chemists Brandt
Uses   for the production of cobalt alloys resistant to elevated temperatures, as well as for pigments for colouring glass.

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© 2004 Büro für angewandte Mineralogie · Dr. Stephan Rudolph · D-47918 Tönisvorst
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