Periodic Table of Elements




Lutetium was independently discovered in 1907 by French scientist Georges Urbain, Austrian mineralogist Baron Carl Auer von Welsbach, and American chemist Charles James.

Name: Lutetium
Symbol: Lu
Atomic number: 71
Atomic weight: 174.97
State: solid
Group, period, block: n/a, 6, f
Color: silvery white
Classification: lanthanide
Electron configuration: 6s2 4f14 5d1

Physical properties

Density: 9.841 g/cm-3
Melting point: 1925 K,1652 C,3006 F
Boiling point: 3675 K,3402 C,6156 F

Atomic properties

Oxidation states: 3, 2, 1
Electronegativity: 1.27 (Pauling scale)
Ionization energies: 1st: 523.5 kJmol-1
Covalent radius: 1878 pm
Van der Waals radius: no data
  • Lu
  • Electron Configuration


There are two naturally occurring isotopes of lutetium exist, 175Lu, and 176Lu.