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 uses cookies to ensure that we give you the best experience on our website. By using this site, you agree to our Privacy Policy and our Terms of Use. X