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==Key Stage 3==
===Meaning===
[[File:CaesiumSymbolCaesiumSymbol1.png|right|300px|thumb|The [[Chemical Symbol|chemical symbol]] for [[Caesium]].]]
[[Caesium]] is a [[Group 1]] [[element]], on the [[Periodic Table]], with an [[Atomic Number|atomic number]] of 55.
===About Caesium===