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(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

Symbol: Lu
Atomic Number: 71
Atomic Weight: 174.967
Boiling Point: 3668 K
Melting Point: 1936 K
Density at 300K: 9.84 g/cm3
Covalent radius: 1.56
Atomic radius: 2.25
Atomic volume: 17.8 cm3/mol
First ionization potental: 5.43 V
Specific heat capacity: 0.15 Jg-1K-1
Thermal conductivity: 16.4 Wm-1K-1
Electrical conductivity: 1.5*106Ω-1m-1
Heat of fusion: 18.6 kJ/mol
Heat of vaporization: 355 kJ/mol
Electronegativity: 1.27 (Pauling's)

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