Cesium is the fifth member of the alkali family, the elements that make up Group 1 of the periodic table. Its atomic number is 55, its atomic mass is 132.9054, and its chemical symbol is Cs.
Cesium is an alkali metal element denoted by the atomic symbol Cs. It has an atomic number of 55 and an atomic weight of 132.91. It is a very soft, white metal which is not particularly abundan...
Group 1 (Ia) Alkali Metal Pronunciation
Cesium is a member of the alkali family, which consists of elements in Group ...
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 pol...