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...