Protactinium
Electron Configuration: 2,8,18,32,20,9,2
Enthalpy of Fusion (kJ mol-1): 16.7
Enthalpy of Vaporisation (kJ mol-1): 481
Atomic Radii
Atomic Radius 180 pm
Bohr Radius 0 pm
Covalent Radius 0 pm
Van der Waals 0 pm
Oxidation States
Main Pa+5
Other Pa+3, Pa+4
Ionisation Energies (kJ mol-1) show graph
M - M+ 568