(So named (
Latin Lutetia, "
Paris") by
G. Urbain,
French chemist, after his native city) A soft, silvery-white
chemical element, one of the
rare-earth metals and the last member of the
lanthanide series.
Symbol: Lu
Atomic number: 71
Atomic weight: 174.967
Density (at room temperature and pressure): 9.84 g/cc
Melting point: 1,663°C
Boiling point: 3,402°C
Valence: +3
Ground state electron configuration: [Xe]4f145d16s2