Europium

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

Contents

General Information about Europium

Regular nameEuropiumChemical symbolEuOther namesHistorical namesName meaning, originDiscovery (year)OccurencePosition in the PSEGroup membership

Atomar Properties of Europium

Atomic number Z63 = number of protonsStandard Atomic Weight151.964 (1)

Electron configuration of Europium

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	7	2	6			2

Shorthand electron configuration of Europium: [Xe] 4f⁷ 6s² .

Ionization Energies of Europium

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 Europium atom.

IE1	IE2	IE3	IE4
5.67038	11.25	24.92	42.7

Isotopic Data of Europium

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

Chemistry of Europium

Oxidation states+3. +2Electronegativity1.1 (Pauling original)
1.20 (Pauling)Electron affinity0.116(13) eV
11.2(13) kJ mol^-1

Standard Electrode Potential

E⁰ (V)	Symbol	N_ox	Name Ox. Name Red.	Ox. Red.	e^-
-2.812	Eu	+ II 0	Europium(II) cation Europium	Eu²⁺ ⇄ Eu (s)	+ 2 e^-
-0.35	Eu	+ III + II	Europium(III) cation Europium(II) cation	Eu³⁺ ⇄ Eu²⁺	+ e^-

Material and Physical Properties

Melting point822 °CEnthalpy of fusion (molar)9.21 kJ mol^-1Boiling point1529 °CEnthalpy of vaporization175.7 kJ mol^-1Density5.264 g cm^-3 (20 °C)

External Data, Identifiers

CAS registry number7440-53-1InChI =1S/EuInChIKeyOGPBJKLSAFTDLK-UHFFFAOYSA-NPubChem ID23981

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isotopes

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Last update: 2022-12-12

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