73 Ta Tantalum 180.95
Transition metal
Tantalum 钽
[Xe] 4f¹⁴ 5d³ 6s²
- Period 6
- Group 5
- Block d
- Solid
Electron configuration
1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 4f¹⁴ 5s² 5p⁶ 5d³ 6s²
Orbital diagram (valence)
- Electrons per shell
- 2, 8, 18, 32, 11, 2
- Unpaired electrons
- 3
- Zeff (Slater)
- 3.30
Properties
- Atomic weight
- 180.95
- Electronegativity (Pauling)
- 1.5
- First ionization energy
- 761.3 kJ/mol
- Electron affinity
- 31.07 kJ/mol
- Covalent radius
- 170 pm
- van der Waals radius
- 217 pm
- Melting point
- 3290 K
- Boiling point
- 5731 K
- Density
- 16.4 g/cm³
- Melting / boiling point
- 3016.8 °C / 5457.9 °C
- Common oxidation states
- +5
- Discovered
- 1802
Periodic trend
Data: PubChem periodic table (public domain); atomic weights are IUPAC abridged standard values; covalent radii from Cordero et al. (2008).