Name Cobalt
Symbol Co
Atomic Number 27
Atomic Mass 8.9332 atomic mass units
Number of Protons 27
Number of Neutrons 32
Number of Electrons 27
Melting Point 1495.0 C
Boiling Point 2870.0 C
Density 8.9 grams per cubic centimeter
Normal Phase Solid
Family Transition Metal
Period Number 4
Cost $21 per 100 grams



Origin of Name From the German word kobalt (koboid), meaning evil spirit
Date and Place of Discovery 1739 in Sweden
Discovered by Georg Brandt
Common Compounds
Interesting facts
  • It is generally found in different ores and cannot be mined alone.
  • It is a by-product of nickel and copper mining.
  • It can also be obtained from arsenic, oxygen and sulfur.
  • It can be magnetized.
  • It is a radioactive metal used in radio-therapy.
  • Powdered cobalt in metal is a fire hazard.
Common Uses
  • Jet engines
  • Magnetic coatings
  • Magnets
  • Cutting tools
  • Ceramics
  • Special glasses


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Chemical Elements
Mineral Information Institute

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