Cesium compounds

Caesium or cesium, is a chemical element with symbol Cs and atomic number 55. It is a soft, silvery-gold alkali metal with a melting point of 28.5 °C (83.3 °F), which makes it one of only five elemental metals that are liquid at or near room temperature. Caesium is an alkali metal and has physical and chemical properties similar to those of rubidium and potassium. Caesium compounds contain the element as the cation Cs+, which binds ionically to a wide variety of anions. One noteworthy exception is provided by the caeside anion (Cs−). Other exceptions include the several suboxides (see section on oxides below). Returning to more normal compounds, salts of Cs+ are almost invariably colourless unless the anion itself is coloured. Many of the simple salts are hygroscopic, but less so than the corresponding salts of the lighter alkali metals. The phosphate, acetate, carbonate, halides, oxide, nitrate, and sulfate salts are water-soluble.

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