Caesium Properties, Molecular Formula, Applications - WorldOfChemicals

Caesium Properties




Caesium is a soft, silvery white-gray metal that occurs in nature as cesium-133. The natural source yielding the greatest quantity of cesium is the rare mineral pollucite. Cesium is used in industry as a catalyst promoter, boosting the performance of other metal oxides in the capacity and for the hydrogenation of organic compounds.The radioactive isotope caesium-137 has a half-life of about 30 years and is used in medical applications, industrial gauges, and hydrology.

Chemical Properties

Appearance Silver Colored Metal
Atomic Number 55
Atomic Weight 132.905 g/mol
Block s
Boiling Point 671 °C
CAS Number 7440-46-2
Class 4.3
Crystal Structure Body-Centered Cubic
Density 1.93 g/cm3
EINECS Number 231-155-4
Electron Configuration 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 5s2 4d10 5p6 6s1
Group 1
Ionization Energy 375.7 KJ/mol
Melting Point 28.44 °C
Oxidation State 1
PG 1
Period 6
RTECS Number FK9225000
Symbol Cs
Synonyms Cesium