Lutetium |
| Symbol | Lu |
|---|---|
| Latin name | Lutecium |
| Atomic number | 71 |
| Period | 6 |
| Element category | Inner transition elements |
| Relative atomic mass | 174.967 |
| Group | III.B |
| Electronegativity | 1.2 |
| Oxidation numbers | 3 |
| Electron configuration | 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p6 4f14 5d1 6s2 |
| Density [g/cm3] | 9.842 |
| State | Solid |
| Melting point [°C] | 1663 |
| Boiling point [°C] | 3395 |
| Atomic radius [pm] | 217 |
| Covalent radius [pm] | 160 |
| Thermal conductivity [W m-1K-1] | 16.4 |
| Heat capacity [J K-1g-1] | 0.15 |
| Discovery | 1907 |
| Vickers hardness [MPa] | 1160 |
| Brinell hardness [MPa] | 893 |
| Young's modulus [GPa] | 69 |
| Electrical conductivity [S m-1] | 1.8 · 106 |
| Shear modulus [GPa] | 27 |
| 1.st ionization energy [eV] | 5.4259 |
| 2.nd ionization energy [eV] | 13.888 |
| 3.rd ionization energy [eV] | 20.957 |
| Stable isotopes | 2 |
| Unstable isotopes | 21 |