In 1860, Cesium was discovered by Gustav Kirchoff and Robert Bunsen in Germany, while using a spectrophotometer to view lines identifying elements in Durkheim mineral water.

Cesium is found in pollucite (a hydrated cesium silicate of aluminum), which is found in North America, Italy, and Kazakhstan, and Sweden. In Madagascar and the Urals, cesium is found in rhodizite (a borate mineral containing aluminum), beryllium, sodium, and some potassium ores.

Cesium is an Alkali metal having an atomic number of 55 and a atomic weight of 132.90545. The element exhibits a metallic silvery gold color. At 298 K, it is a solid, and only slightly above this temperature (301.65 K) it melts. Cesium boils at 951.6 K. It is one of the only three elements that are liquid at room temperature. It is named Cesium because it contains two bright lines in the blue spectrum and the Latin word "caesius" means "sky blue." In reaction...