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Lutetium (Lu)
Atomic number 71 · Lanthanide
| Atomic number | 71 |
|---|---|
| Atomic mass | 174.9668 u |
| Molar mass | 174.9668 g/mol |
| Category | Lanthanide |
| Group / period / block | — / 6 / f |
| Electron configuration | [Xe] 4f14 5d 6s2 |
| Electrons per shell | 2, 8, 18, 32, 9, 2 |
| Electronegativity (Pauling) | 1.0 |
| Atomic radius | 175.0 pm |
| Density | 9.84 g/cm³ |
| First ionisation energy | 5.4259 eV |
| Melting point | 1936.15 K (1663.00 °C) |
| Boiling point | 3675.15 K (3402.00 °C) |
| Common oxidation states | +3 |
| Abundance in Earth's crust | 0.8 ppm |
Uses
PET scanners, cancer therapy
Discovery
1907, Georges Urbain