Cesium is used as a catalyst in the hydrogenation of organic compounds.As cesium is reactive to oxygen, it was used in vacuum tubes to remove the oxygen gas.The electronegativity of cesium is 0.79 on the Pauling scale.The first ionization energy of caesium is 3.894 eV.When cesium reacts with water, it forms cesium hydroxide.Cesium reacts violently with water, phosphorus, sulfur as well as halogens of the periodic table.Cesium has only 1 electron in its outermost orbit and it loses this electron to become stable during a chemical reaction.
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