Samarium

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

Contents

General Information about Samarium

Regular nameSamariumChemical symbolSmOther namesHistorical namesName meaning, originDiscovery (year)OccurencePosition in the PSEGroup membership

Atomar Properties of Samarium

Atomic number Z62 = number of protonsStandard Atomic Weight150.36 (2)

Electron configuration of Samarium

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	6	2	6			2

Shorthand electron configuration of Samarium: [Xe] 4f⁶ 6s² .

Ionization Energies of Samarium

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 Samarium atom.

IE1	IE2	IE3	IE4
5.6437	11.07	23.4	41.4

Isotopic Data of Samarium

An overview of the nuclides as well as the isotopic data and properties are listed on the following page: Samarium isotopes.

Chemistry of Samarium

Oxidation states+3Electronegativity1.1 (Pauling original)
1.17 (Pauling)Electron affinity0.162 eV
15.63 kJ mol^-1

Standard Electrode Potential

E⁰ (V)	Symbol	N_ox	Name Ox. Name Red.	Ox. Red.	e^-
-2.68	Sm	+ II 0	Samarium(II) cation Samarium	Sm²⁺ ⇄ Sm (s)	+ 2 e^-
-2.304	Sm	+ III 0	Samarium(III) cation Samarium	Sm³⁺ ⇄ Sm (s)	+ 3 e^-
-1.55	Sm	+ III + II	Samarium(III) cation Samarium(II) cation	Sm³⁺ ⇄ Sm²⁺	+ e^-

Material and Physical Properties

Melting point1072 °CEnthalpy of fusion (molar)8.62 kJ mol^-1Boiling point1794 °CEnthalpy of vaporization191.6 kJ mol^-1Density7.536 g cm^-3 (20 °C)

External Data, Identifiers

CAS registry number7440-19-9InChI =1S/SmInChIKeyKZUNJOHGWZRPMI-UHFFFAOYSA-NPubChem ID23951

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isotopes

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Last update: 2022-12-12

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