Iridium: Properties


Atomic

  • Atomic Mass: 192.22
  • Electronegativity:
    • Pauling: 2.2
    • Allred: 1.55
    • Absolute: 5.4 eV
  • Electron Affinity: 151 kJ mol-1
  • Polarizability: 7.6 3
  • Effective Nuclear Charge:
    • Slater: 3.9
    • Clementi: 10.57
    • Froese Fischer: 15.33
  • Radius:
    • Ir 2 +: 89 pm
    • Ir 3 +: 75 pm
    • Ir 4 +: 66 pm
    • Atomic: 135.7 pm
    • Covalent: 126 pm
  • Successive Ionization Energies:
    • Ir - Ir + : 880 kJ mol-1
    • Ir+1 - Ir+2 : (1680) kJ mol-1
    • Ir+2 - Ir+3 : (2600) kJ mol-1
    • Ir+3 - Ir+4 : (3800) kJ mol-1
    • Ir+4 - Ir+5 : (5500) kJ mol-1
    • Ir+5 - Ir+6 : (6900) kJ mol-1
    • Ir+6 - Ir+7 : (8500) kJ mol-1
    • Ir+7 - Ir+8 : (10000) kJ mol-1
    • Ir+8 - Ir+9 : (11700) kJ mol-1
  • Common Ions : Ir 2 +, Ir 3 +, Ir 4 +