Atomic Radii
Atomic Radius
Bohr Radius
Covalent Radius
Van der Waals
| Protactinium | |
| Electron Configuration | 2,8,18,32,20,9,2 |
| Electron Configuration | [Rn] 5f2 6d1 7s2 |
| Electronegativity | 1.5 |
| Enthalpy of Fusion | 16.7 kJ mol-1 |
| Enthalpy of Vaporisation | 481 kJ mol-1 |
| Heat Capacity | ? J mol-1 K-1 |
| Thermal Conductivity | 47 W m-1 K-1 |
| Thermal Expansion | ? μm m-1 K-1 |
| Magnetic ordering | No data |
| Electrical resistivity | 177 Ω m |
| 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)  |
|
| M - M+ |
568 |