Tantalum: Properties


Atomic

  • Atomic Mass: 180.9479
  • Electronegativity:
    • Pauling: 1.5
    • Allred: 1.33
    • Absolute: 4.11 eV
  • Electron Affinity: 14 kJ mol-1
  • Polarizability: 13.1 3
  • Effective Nuclear Charge:
    • Slater: 3.3
    • Clementi: 9.53
    • Froese Fischer: 13.78
  • Radius:
    • Ta 3 +: 72 pm
    • Ta 4 +: 68 pm
    • Ta 5 +: 64 pm
    • Atomic: 143 pm
    • Covalent: 134 pm
  • Successive Ionization Energies:
    • Ta - Ta + : 761 kJ mol-1
    • Ta+1 - Ta+2 : (1500) kJ mol-1
    • Ta+2 - Ta+3 : (2100) kJ mol-1
    • Ta+3 - Ta+4 : (3200) kJ mol-1
    • Ta+4 - Ta+5 : (4300) kJ mol-1
  • Common Ions : Ta 3 +, Ta 4 +, Ta 5 +