Tantalum |
| Symbol | Ta |
|---|---|
| Latin name | Tantalum |
| Atomic number | 73 |
| Period | 6 |
| Element category | Transition elements |
| Relative atomic mass | 180.9479 |
| Group | V.B |
| Electronegativity | 1.5 |
| Oxidation numbers | 5 |
| Electron configuration | 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p6 4f14 5d3 6s2 |
| Density [g/cm3] | 16.654 |
| State | Solid |
| Melting point [°C] | 2996 |
| Boiling point [°C] | 5660 |
| Atomic radius [pm] | 200 |
| Covalent radius [pm] | 138 |
| Thermal conductivity [W m-1K-1] | 57.5 |
| Heat capacity [J K-1g-1] | 0.14 |
| Discovery | 1802 |
| Hardness [Mohs scale] | 6.5 |
| Vickers hardness [MPa] | 873 |
| Brinell hardness [MPa] | 800 |
| Young's modulus [GPa] | 186 |
| Electrical conductivity [S m-1] | 8.1 · 106 |
| Shear modulus [GPa] | 69 |
| 1.st ionization energy [eV] | 7.89 |
| Stable isotopes | 2 |
| Unstable isotopes | 18 |