D002586Level 5

Cesium

**Definition:** A member of the alkali metals. It has an atomic symbol Cs, atomic number 55, and atomic weight 132.91. Cesium has many industrial applications, including the construction of atomic clocks based on its atomic vibrational frequency.

**Tree numbers:** - D01.268.549.125 - D01.268.556.165 - D01.552.528.160 - D01.552.544.165

**Synonyms:** - Cesium-133 - Caesium - Caesium-133

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D002587Cesium Isotopes

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