Atomic Number: 55 Period Number: 6 Group Number: 1
Cesium (Caesium) is a soft and silvery-gold metal, which belongs to the alkali group. It is a very rare element and the main source of it is Canada and Zimbabwe. Cesium is mined mostly from pollucite. Cesium has a total of 39 known isotopes and ranges from 112 to 151.
Cesium is used in photoelectric cells, which are devices used to convert sunlight into electricity. The electrons in cesium atoms are stimulated by direct sunlight, and in photoelectric cells these electrons flow to create an electric current. Cesium is an ideal catalyst during this process. 137Cs is used in radiation therapy to treat various forms of cancer because of its radioactive.
Cesium compounds is also very useful. Cesium Graphite is used as a method of moving trace amount of radioactive cesium form the hot loop of sodium-cooled reactors due to its relatively high heat of formation. Cesium Chloride is used as phase transfer catalyst in organic chemistry. Cesium carbonate is an important base for organic chemistry to synthesize various compounds.
Physical and Chemical properties:
Atomic Weight: 132.9054519
Melting Point: 301.59 K
Boiling Point: 944 K
Density: 1.93 g/cm3
Phase at Room Temperature: Solid
Element Classification: Metal
Ionization Energy: 3.894 eV
Oxidation State: +1