Cesium
Chemical, physical and material properties and data of the chemical element Cesium.
General Information about Cesium
Regular nameCesiumChemical symbolCsOther namesSystematic nameHistorical namesName meaning, originDiscovery (year)OccurencePosition in the PSEGroup membership
Atomar Properties of Cesium
Atomic number Z55 = number of protonsStandard Atomic Weight132.90545196 (6)
Electron configuration of Cesium
| 1s | 2s | 2p | 3s | 3p | 3d | 4s | 4p | 4d | 4f | 5s | 5p | 5d | 5f | 6s | 6p | 6d | 6f | 7s | 7p |
|---|
| 2 | 2 | 6 | 2 | 6 | 10 | 2 | 6 | 10 | | 2 | 6 | | | 1 | | | | | |
Abbreviated form: [Xe] 6s1 .
Ionization Energies of Cesium
The following table lists the ionization energies IE (ionization potentials); the IE is the energy required in electron volts (eV) per atom to separate a given electron from an Cesium atom.
Isotopic Data of Cesium
An overview of the nuclides as well as the isotopic data and properties are listed on the following page: Cesium isotopes.
Chemistry of Cesium
Valence electrons1Oxidation states+1 (-1)Electronegativity0.7 (Pauling original)
0.79 (Pauling)
0.659 (Allen)
1.0 (Mulliken)
0.69 (Sanderson)
0.86 (Allred-Rochow)
2.18 eV (Pearson)Electron affinity0.471 630(25) eV
45.505(3) kJ mol-1
Standard Electrode Potential
| E0 (V) | Symbol | Nox | Name Ox.
Name Red. | Ox.
Red. | e- |
|---|
| -3.026 | Cs | + I
0 | Cesium cation
Cesium | Cs+
⇄ Cs | + e- |
Material and Physical Properties
Melting point28.44 °CEnthalpy of fusion (molar)2.09 kJ mol-1Boiling point671 °CEnthalpy of vaporization66.1 kJ mol-1Density1.93 g cm-3
External Data, Identifiers
CAS registry number7440-46-2InChI =1S/CsInChIKeyTVFDJXOCXUVLDH-UHFFFAOYSA-NPubChem ID5354618
Last update: 2022-12-14
Perma link: https://www.chemlin.org/chemical-elements/cesium.php
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