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Cesium • Alkali Metal

Primary XPS region: Cs3d
Overlapping regions: N/A
Binding energies of common chemical states:

Chemical state Binding energy Cs3d5/2/eV
Csl 724

Experimental Information


Interpretation of XPS spectra

General comments

hexAbout This Element

Symbol: Cs
Date of Discovery: 1860
Name Origin: Latin caesius
Appearance: silver
Discoverer: Fustov Kirchoff
Obtained From: pollucite, lepidolite

Melting Point: 28.5 K
Boiling Point: 678.4 K Density[kg/m3]: 1.873
Molar Volume: 70.94 × 10-6 m3/mol Protons/Electrons: 55
Neutrons: 78
Shell Structure: 2,8,18,18,8,1
Electron Configuration: [Xe]6s1
Oxidation State: 1
Crystal Structure: Cubic

Cesium, also spelled caesium, is a slivery-gold metal that is liquid at or around room temperature. This element’s name is derived from the Latin caesius, meaning sky blue. Cesium reacts explosively with water. Cesium hydroxide is a very strong base that can rapidly etch the surface of glass. The most widespread use of cesium is in drilling fluids for the oil industry which mitigates the necessity of toxic suspended solids in drilling fluids. Cesium is also used in atomic clocks, in particular its isotope of atomic weight 133 (Cs-133).


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