Lutetium (Lu)
Lutetium (Lu) is element 71 of the periodic table, a lanthanide in period 6 and group 3. Its standard atomic weight is 174.9668, so one mole of lutetium atoms has a mass of 174.9668 g. At room temperature it is a solid; it melts at 1662.85 °C and boils at 3401.85 °C.
| Atomic number | 71 |
|---|---|
| Symbol | Lu |
| Standard atomic weight | 174.9668 |
| Molar mass | 174.9668 g/mol |
| Category | Lanthanide |
| Group | 3 |
| Period | 6 |
| Block | d-block |
| Electron configuration | [Xe] 6s2 4f14 5d1 |
| Oxidation states | +3 |
| Electronegativity (Pauling) | 1.27 |
| Atomic radius (van der Waals) | 221 pm |
| First ionisation energy | 5.426 eV (523.5 kJ/mol) |
| Electron affinity | — |
| State at room temperature | Solid |
| Melting point | 1936 K (1662.85 °C) |
| Boiling point | 3675 K (3401.85 °C) |
| Density | 9.84 g/cm³ |
| Discovered | 1907 |
Group 3
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Atomic weight: IUPAC CIAAW standard atomic weight. Other properties: PubChem (U.S. National Library of Medicine, public domain). Values such as melting point and radius depend on how they were measured; check a data book for precise work.