Tantalum
Chemical, physical and material properties and data of the chemical element Tantalum.
General Information about Tantalum
Regular nameTantalumChemical symbolTaOther namesTantaliumSystematic nameHistorical 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 | | | | | |
Abbreviated form: [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 volts (eV) per atom to separate a given electron from an Tantalum atom.
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 | Nox | 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 | TaF72-
⇄ 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
Last update: 2023-05-01
Perma link: https://www.chemlin.org/chemical-elements/tantalum.php
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