Thulium: Properties


Atomic

  • Atomic Mass: 168.93421
  • Electronegativity:
    • Pauling: 1.25
    • Allred: 1.11
    • Absolute: <3.4 eV
  • Electron Affinity: <50 kJ mol-1
  • Polarizability: 21.8 3
  • Effective Nuclear Charge:
    • Slater: 2.85
    • Clementi: 8.58
    • Froese Fischer: 11.8
  • Radius:
    • Tm 3 +: 87 pm
    • Tm 4 +: 94 pm
    • Atomic: 174.6 pm
    • Covalent: 156 pm
  • Successive Ionization Energies:
    • Tm - Tm + : 596.7 kJ mol-1
    • Tm+1 - Tm+2 : 1163 kJ mol-1
    • Tm+2 - Tm+3 : 2285 kJ mol-1
    • Tm+3 - Tm+4 : 4119 kJ mol-1
  • Common Ions : Tm 3 +, Tm 4 +