• Latin name:
  Cobaltum
• English name:
  Cobalt
• Year discovered:
  1735
• Discovered by:
  Georg Brandt
• Country of Discovery:
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• Cost per 100 grams:
  29.1 USD
• CAS Number:
  CAS7440-48-4
• Electron shell:
  K2-L8-M15-N2-O0-P0-Q0-R0

Cobalt is a chemical element with symbol Co and atomic number 27. Like nickel, cobalt in the Earth's crust is found only in chemically combined form, save for small layering found in alloys of natural meteoric iron. The free element, produced by reductive smelting, is a hard, lustrous, silver-gray metal.

• Atomic number:
  27
• Atomic weight (Relative atomic mass):
  58.9331935652212 (g/mol)
• Density:
  8.90 (g/cm³)
• Melting point:
  1495.0°C = 2723.00°F = 1768.15K
• Boiling point:
  2927.0°C = 5300.60°F = 3200.15K
• Valence electrons:
  2, 3
• Period:
  4
• Group:
  
• Block:
  d - block
• Emission spectrum:
  

• Phase:
  Solid

  
• Fusion heat:
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• Specific heat:
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• Thermal expansion:
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• Vaporization heat:
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• Electron configuration:
  [Ar] 3d7 4s2 = 1s2 2s2 2p6 3s2 3p6 3d7 4s2
Oxidation states:

• 0
• -1
• -
• -
• -
• -
• -
• +2
• +3
• +4
• +5
• -
• -
• -
• -
• Ion charge:
  Co^{2+, 3+}
• The ionization potential of an atom:
  7.881 (eV)
• Atomic radius:
  152 (pm)
• Covalent radius:
  118 (pm)
• Van der Waals radius:
  192 (pm)

• Electrical conductivity:
  16025641.025641 (S/m)
• Electrical type:
  Conductor
• Magnetic type:
  Ferromagnetism
• Volume magnetic susceptibility:
  ----
• Mass magnetic susceptibility:
  ----
• Molar magnetic susceptibility:
  ----
• Resistivity:
  6.24 ⋅ 10^-8 (Ω · m)
• Superconducting point:
  ----

• Debye temperature:
  111.85°C = 233.33°F = 385K

• Colour:
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• CAS Number:
  CAS7440-48-4
• CID Number:
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• RTEC Number:
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• Brinell hardness:
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• Mohs hardness:
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• Vickers hardness:
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• Bulk modulus:
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• Young's modulus:
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• Liquid density:
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• Molar volume:
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• Poisson's ratio:
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• Shear modulus:
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• Speed of sound transmission:
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• Refractive index:
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• Thermal conductivity:
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• Electronegativity:
  1.88
• Valence electrons:
  2, 3
• Electron affinity:
  63.898 kJ/mole

• Radioactive:
  No
• Half life:
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• Lifetime:
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• Neutron cross section, barn:
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• Universe contains "Cobalt" at the rate of
  0.0003%
• Sun contains "Cobalt" at the rate of
  0.0004%
• Oceans contain "Cobalt" at the rate of
  8 ⋅ 10^-7%
• Human body contains "Cobalt" at the rate of
  4.28046102 ⋅ 10^-6%
• The Earth's crust consists of "Cobalt" at the rate of
  0.0025%
• Meteorites consist of "Cobalt" at the rate of
  0.059%