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Astronomy Chemical element

Calcium

Calcium (Ca) is a chemical element belonging to the category Alkaline earth metal, with atomic number 20 and atomic mass 40.0780 u. This sheet describes its fundamental properties, periodic position and physical characteristics.

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Astronomy · Chemical element

Calcium

ELK

Identity

  • Name: Calcium
  • Symbol: Ca
  • Atomic number: 20
  • Atomic mass: 40.0780 u

Position in the periodic table

  • Group: 2
  • Period: 4
  • Category: Alkaline earth metal

Physico-chemical properties

  • Standard state: Solid
  • Melting point: 842°C (1115 K)
  • Boiling point: 1484°C (1757 K)
  • Density: 1.54 g/cm³ at 20°C
  • Electron configuration: [Ar] 4s²

Scientific description

Calcium is a chemical element with symbol Ca and atomic number 20. It belongs to the category of alkaline earth metals and occupies group 2 and period 4. Its standard atomic mass is 40.0780 u.