Cesium

Chemical, physical and material properties and data of the chemical element Cesium.

Contents

General Information about Cesium

Regular nameCesiumChemical symbolCsOther namesHistorical 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

Shorthand electron configuration of Cesium: [Xe] 6s¹ .

Ionization Energies of Cesium

The following table lists the ionization energies IE (ionization potentials); the IE is the energy required in electron volt (eV) per atom to separate a given electron from an Cesium atom.

IE1	IE2
3.893905	23.15744

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	N_ox	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

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isotopes

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Last update: 2022-12-14

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