Element | Neptunium | Symbol | Np |
Atomic Number | 93 | Molar Mass | 237.05 g mol-1 |
Electron Configuration | [Rn]5f46d17s2 | Normal State | solid metal |
Density @STP | 20.45 g cm-3 | Melting Point | 644oC |
Boiling Point | 3902oC | Stable Isotopes | none |
Atomic Radius | 131 pm | Ionic Radius | 88 (5+) pm |
Electronegativity (Pauling) | 1.3 | Ionization Energy (1st) | 604.5 kJ mol-1 |
Ionization Energy (2nd) | kJ mol-1 | Ionization Energy (3rd) | kJ mol-1 |
Molar Heat Capacity | J K-1mol-1 | Standard Molar Entropy | J K-1mol-1 |
Enthalpy of Fusion | kJ mol-1 | Enthalpy of Vapourization | kJ mol-1 |