What Is Cesium?

Cesium (Caesium; Cesium) is a light golden yellow, lively metal with a low melting point and is easily oxidized in the air. It can react violently with water to generate hydrogen and explode ^[1] . Cesium has no elemental form in nature, and it is rarely distributed in land and ocean only in the form of salt. Cesium is an important material for manufacturing vacuum parts, photocells and the like. Radionuclide Cs-137 is one of the radioactive contamination leaked from the Fukushima Daiichi Nuclear Power Plant in Japan.