Neptunium (Np)
A fascinating actinide element.
Neptunium is element 93 on the periodic table.
Element properties
- Atomic number
- 93
- Symbol
- Np
- Atomic mass
- 237 u
- Category
- Actinide
- Period
- 7
- Group
- Not assigned
- Block
- f
- State
- Solid
- Electron configuration
- [Rn] 5f4 6d1 7s2
- Electronegativity (Pauling)
- 1.36
- Density
- 20.45 g/cm³
- Melting point
- 644 °C
- Boiling point
- 3902 °C