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Most likely Ceasium is a common misspelling of the name for the 55th element: Caesium or Cesium, symbol Cs.

(The misspelling can be understood when written phonetically after the correct pronounciation: "see-zee-əm" . It should not be pronounced as "kee-zee-əm" as would be expected from -the correct- spelling 'CAE...')

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13y ago

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