Tantalum

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

Contents

General Information about Tantalum

Regular nameTantalumChemical symbolTaOther namesTantaliumHistorical namesName meaning, originDiscovery (year)OccurencePosition in the PSEGroup membership

Atomar Properties of Tantalum

Atomic number Z73 = number of protonsStandard Atomic Weight180.94788 (2)

Electron configuration of Tantalum

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	14	2	6	3		2

Shorthand electron configuration of Tantalum: [Xe] 4f¹⁴ 5d³ 6s² .

Ionization Energies of Tantalum

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 Tantalum atom.

IE1
7.54957

Isotopic Data of Tantalum

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

Chemistry of Tantalum

Oxidation states+5Electronegativity1.5 (Pauling original)
1.50 (Pauling)
1.34 (Allen)
4.11 eV (Pearson)Electron affinity0.323(12) eV
31(2) kJ mol^-1

Standard Electrode Potential

E⁰ (V)	Symbol	N_ox	Name Ox. Name Red.	Ox. Red.	e^-
-0.750	Ta	+ V 0	Tantalum(V) oxid Tantalum	Ta₂O₅ + 10 H⁺ ⇄ 2 Ta (s) + 5 H₂O	+ 10 e^-
-0.6	Ta	+ III 0	Tantalum(III) cation Tantalum	Ta³⁺ ⇄ Ta (s)	+ 3 e^-
-0.45	Ta	+ V 0	Tantalum heptafluoride dianion Tantalum	TaF₇^2- ⇄ Ta + 7 F^-	+ 5 e^-

Material and Physical Properties

Melting point3017 °CEnthalpy of fusion (molar)36.57 kJ mol^-1Boiling point5455 °CEnthalpy of vaporization753 kJ mol^-1Density16.69 g cm^-3 (20 °C)

External Data, Identifiers

CAS registry number7440-25-7InChI =1S/TaInChIKeyGUVRBAGPIYLISA-UHFFFAOYSA-NPubChem ID23956

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Last update: 2023-05-01

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