Cesium is a chemical element with the symbol Cs and atomic number 55. It is a soft, silvery-golden 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.
Cesium is a chemical element with the symbol Cs and atomic number 55. It is a soft, silvery-golden a