• Latin name:
  Сalcium
• English name:
  Calcium
• Year discovered:
  1808
• Discovered by:
  Humphry Davy
• Country of Discovery:
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• Cost per 100 grams:
  4 USD
• CAS Number:
  CAS7440-70-2
• Electron shell:
  K2-L8-M8-N2-O0-P0-Q0-R0

Calcium is a chemical element with symbol Ca and atomic number 20. Calcium is a soft gray alkaline earth metal, fifth-most-abundant element by mass in the Earth's crust. The ion Ca2+ is also the fifth-most-abundant dissolved ion in seawater by both molarity and mass, after sodium, chloride, magnesium, and sulfate.

• Atomic number:
  20
• Atomic weight (Relative atomic mass):
  40.0780224976209 (g/mol)
• Density:
  1.54 (g/cm³)
• Melting point:
  842.0°C = 1547.60°F = 1115.15K
• Boiling point:
  1484.0°C = 2703.20°F = 1757.15K
• Valence electrons:
  2
• Period:
  4
• Group:
  IIA
• Block:
  s - 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] 4s2 = 1s2 2s2 2p6 3s2 3p6 4s2
Oxidation states:

• -
• -
• -
• -
• -
• -
• -
• +2
• -
• -
• -
• -
• -
• -
• -
• Ion charge:
  Ca²⁺
• The ionization potential of an atom:
  6.113 (eV)
• Atomic radius:
  194 (pm)
• Covalent radius:
  174 (pm)
• Van der Waals radius:
  231 (pm)

• Electrical conductivity:
  29761904.7619048 (S/m)
• Electrical type:
  Conductor
• Magnetic type:
  Paramagnetism
• Volume magnetic susceptibility:
  2.139 ⋅ 10^-5
• Mass magnetic susceptibility:
  1.38 ⋅ 10^-9
• Molar magnetic susceptibility:
  5.531 ⋅ 10^-10 (m³/mol)
• Resistivity:
  3.36 ⋅ 10^-8 (Ω · m)
• Superconducting point:
  ----

• Debye temperature:
  -43.15°C = -45.67°F = 230K

• Colour:
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• CAS Number:
  CAS7440-70-2
• 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
• Valence electrons:
  2
• Electron affinity:
  2.37 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 "Calcium" at the rate of
  0.007%
• Sun contains "Calcium" at the rate of
  0.007%
• Oceans contain "Calcium" at the rate of
  4.2 ⋅ 10^-4%
• Human body contains "Calcium" at the rate of
  1.42682033852507%
• The Earth's crust consists of "Calcium" at the rate of
  4.15%
• Meteorites consist of "Calcium" at the rate of
  1.1%