... Terbium - Properties and Data

Terbium

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

Contents

General Information about Terbium

Regular nameTerbiumChemical symbolTbOther namesHistorical namesName meaning, originDiscovery (year)OccurencePosition in the PSEGroup membership

Atomar Properties of Terbium

Atomic number Z65 = number of protonsStandard Atomic Weight158.925354 (8)

Electron configuration of Terbium

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	9	2	6			2

Shorthand electron configuration of Terbium: [Xe] 4f⁹ 6s² .

Ionization Energies of Terbium

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 Terbium atom.

IE1	IE2	IE3	IE4
5.8638	11.52	21.91	39.37

Isotopic Data of Terbium

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

Chemistry of Terbium

Oxidation states+3Electronegativity1.1 (Pauling original)
1.20 (Pauling)Electron affinity1.165 eV
112.4 kJ mol^-1

Standard Electrode Potential

E⁰ (V)	Symbol	N_ox	Name Ox. Name Red.	Ox. Red.	e^-
-2.31	Tb	+ III 0	Terbium(III) cation Terbium	Tb³⁺ ⇄ Tb	+ 3 e^-
3.1	Tb	+ IV 0	Terbium(IV) cation Terbium	Tb⁴⁺ ⇄ Tb (s)	+ 4 e^-

Material and Physical Properties

Melting point1359 °CEnthalpy of fusion (molar)10.15 kJ mol^-1Boiling point3230 °CEnthalpy of vaporization391 kJ mol^-1Density8.23 g cm^-3

External Data, Identifiers

CAS registry number7440-27-9InChI =1S/TbInChIKeyGZCRRIHWUXGPOV-UHFFFAOYSA-NPubChem ID23958

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isotopes

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Last update: 2022-12-12

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