Lutetium was the last of the rare earth metals to be discovered. It is also the final element of the lanthanides. In its pure form, lutetium is very reactive and ignites easily. It is rare and currently has few uses, mainly as part of catalysts in petroleum refining processes.

Summary of properties (Lu)

Atomic weight174.9668(1)
Discoverer (year)Urbain, Georges (1907)
Natural formmetallic solid (hexagonal)
Electron configuration[Xe] 414 5d1 6s2
Melting point (ºC)1656
Boiling point (ºC)3315
Abundance in earth's crust (ppm)0.8
Isotope (abundance)175Lu (97.41), 176Lu (2.59)
Density g/cm39.84
Van der Waals radius (pm)224
Covalent radius (pm)172
Electronegativity (Pauling)1.27
Vaporization enthalpy (kJ/mol)428.00
Enthalpy of fusion (kJ/mol)22.00
Specific heat capacity (J/g·K) at 25ºC and 1 atm0.15
Thermal conductivity (W/cm·K) at 25ºC and 1 atm0.160
Oxidation state+3
Electron affinity (eV)0.34
1st Ionization potential (eV)5.4259

Back to the Periodic Table of the Elements.