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Astronomy Chemical element

Potassium

Potassium (K) is a chemical element belonging to the category Alkali metal, with atomic number 19 and atomic mass 39.0983 u. This sheet describes its fundamental properties, periodic position and physical characteristics.

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Astronomy · Chemical element

Potassium

ELJ

Identity

  • Name: Potassium
  • Symbol: K
  • Atomic number: 19
  • Atomic mass: 39.0983 u

Position in the periodic table

  • Group: 1
  • Period: 4
  • Block: s-block
  • Category: Alkali metal

Physico-chemical properties

  • Standard state: Solid
  • Melting point: 63.5°C (336.7 K)
  • Boiling point: 759°C (1032 K)
  • Density: 0.862 g/cm³
  • Electron configuration: [Ar] 4s¹

Scientific description

Potassium is a chemical element with symbol K and atomic number 19. It is an alkali metal located in group 1, period 4 of the periodic table and belongs to the s-block. Its standard atomic mass is 39.0983 u.