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Astronomy Chemical element

Cezio

Cezio (Cs) is a chemical element belonging to the category Alkali metal, with atomic number 55 and atomic mass 132.9055 u. This sheet describes its fundamental properties, periodic position and physical characteristics.

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Astronomy · Chemical element

Caesium

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Identity

  • Name: Cezio
  • Symbol: Cs
  • Atomic number: 55
  • Atomic mass: 132.9055 u

Position in the periodic table

  • Group: 1
  • Period: 6
  • Category: Alkali metal

Physico-chemical properties

  • Standard state: Solid (almost liquid near room temperature)
  • Melting point: Very low (≈28.5°C)
  • Density: 1.87 g/cm³
  • Electron configuration: [Xe] 6s¹

Scientific description

Cezio is a chemical element with symbol Cs and atomic number 55. It belongs to the category of Alkali metal and occupies group 1 and period 6. Its standard atomic mass is 132.9055 u.