Tantalum (Ta)
Tantalum
Tantalum (Ta) is a transition metal in period 6, group 5. Its relative atomic mass is 180.95 and the molar mass of the atom is 180.95 g/mol.
Atomic number 73
Atomic mass 180.95
Molar mass 180.95 g/mol
Category Transition metal Solid
Properties of tantalum
| Atomic number | 73 |
|---|---|
| Symbol | Ta |
| Latin name | Tantalum |
| Relative atomic mass | 180.95 |
| Molar mass | 180.95 g/mol |
| Group, period, block | 5, 6, d |
| Category | Transition metal |
| State at 20 °C | Solid |
| Electron configuration | [Xe] 4f¹⁴ 5d³ 6s² |
| Electronegativity (Pauling) | 1.5 |
| Atomic radius | 145 pm |
Electron configuration of tantalum
Electrons per shell
K2L8M18N32O11P2
Full notation
1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 4f¹⁴ 5s² 5p⁶ 5d³ 6s²
Noble-gas notation
73 protons · 73 electrons[Xe] 4f¹⁴ 5d³ 6s²
Formula and compounds of tantalum
Simple substanceTatantalumMolar mass of Ta: 180.95 g/mol
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Frequently asked questions
The relative atomic mass of tantalum is 180.95, so the molar mass of the atom is 180.95 g/mol.
Full: 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 4f¹⁴ 5s² 5p⁶ 5d³ 6s². Noble-gas notation: [Xe] 4f¹⁴ 5d³ 6s².