Terbium |
| Symbol | Tb |
|---|---|
| Latin name | Terbium |
| Atomic number | 65 |
| Period | 6 |
| Element category | Inner transition elements |
| Relative atomic mass | 158.92534 |
| Group | III.B |
| Electronegativity | 1.2 |
| Oxidation numbers | 3, 4 |
| Electron configuration | 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p6 4f9 5d0 6s2 |
| Density [g/cm3] | 8.253 |
| State | Solid |
| Melting point [°C] | 1360 |
| Boiling point [°C] | 3123 |
| Atomic radius [pm] | 225 |
| Thermal conductivity [W m-1K-1] | 11.1 |
| Heat capacity [J K-1g-1] | 0.18 |
| Discovery | 1843 |
| Vickers hardness [MPa] | 863 |
| Brinell hardness [MPa] | 677 |
| Young's modulus [GPa] | 56 |
| Electrical conductivity [S m-1] | 8.3 · 105 |
| Shear modulus [GPa] | 22 |
| 1.st ionization energy [eV] | 5.8639 |
| 2.nd ionization energy [eV] | 11.525 |
| 3.rd ionization energy [eV] | 21.91 |
| Stable isotopes | 1 |
| Unstable isotopes | 23 |