Cesium (Cs) Properties and Facts

Element 55 - Alkali Metal

What are the basic properties of Cesium?

Cesium (symbol: Cs) is a alkali metal with atomic number 55. Its atomic mass is 132.91 u, and it belongs to period 6 and group 1.

What is the electron configuration of Cesium?

The electron configuration is: 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 5s² 5p⁶ 6s¹

What are the physical properties of Cesium?

Melting point: 301.59 K
Boiling point: 944.0 K
Density: 1.93 g/cm³

What are the known isotopes of Cesium?

  • Cs-133: 100.0% abundance
  • Cs-137: Half-life of 30.17 years

What is the biological role and occurrence of Cesium?

Biological role: No known biological role
Natural occurrence: Found in pollucite mineral

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