Cesium as a noun is the chemical element (symbol cs) with an atomic number of 55. it is a soft, gold-colored, highly reactive alkali metal. while Caesium as a noun is a metallic chemical element (symbol cs) with an atomic number of 55.
Part of speech: noun
Definition: The chemical element (symbol Cs) with an atomic number of 55. It is a soft, gold-colored, highly reactive alkali metal.
Part of speech: noun
Definition: A metallic chemical element (symbol Cs) with an atomic number of 55.
We hope you now know whether to use Cesium or Caesium in your sentence.