| Property | Value |
|---|---|
| Atomic number | 93 |
| Atomic weight | 237.0482 amu |
| Element family | Actinoids |
| Electronic configuration | 1s2 |
| Stable and very long lived isotopes | None |
| Previous element | Uranium |
| Next element | Plutonium |
| Density | 20.25 g/cm3 (STP) |
| Melting | 640 °C |
| Boiling | 3902 °C |
| Covalent radius | 1.71 Å |
| Ionic radius | 0.75 Å |
| Metallic radius | 1.55 Å |
| First ionization potential | 6.265 eV |
| Electron affinity | 0.480 eV |
| Electronegativity | 1.36 |
| Discovery year | 1940 |
Neptunium is an element number 93 from actinoids family. Its symbol is Np. Neptunium atomic weight is 237.0482 amu. Np has no stable or long lived isotopes. Neptunium electronic configuration is 1s22s22p63s23p63d104s24p64d104f145s25p65d106s26p67s26d15f4. Neptunium density is 20.25 g/cm3 (STP). Neptunium melting point is 640 °C. Neptunium boiling point is 3902 °C. Neptunium covalent radius is 1.71 Å. Neptunium ionic radius is 0.75 Å. Neptunium covalent radius is 1.55 Å. Neptunium first ionization potential is 6.265 eV. Neptunium first ionization potential is 0.480 eV. Neptunium electronegativity by Pauling scale is 1.36. Neptunium was discovered in 1940.
Please let us know how we can improve this web app.
