Periodic Table · element

Caesium

Cs · Z 55

atomic number: 55
atomic mass: 132.91
notation: Cs
group: 1: Lithium
period: 6
state0c: Solid
state20c: Solid
occurrence: Primordial
density: 1.873
melting pt: 28.4
boiling pt: 671
discovered: 1860
abundance: 3

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From the All Periodical Elements database in Notion, last edited 2026-08-15. This page is the row, rendered by the build; nothing on it is written by hand.