Characteristics of the element
| Symbol: Np |
| Name: Neptunium |
| Latin name: Neptunium |
| Atomic number: 93 |
| Atomic mass: 237 |
| Melting point: 640 (°C) |
| Boiling point: 3902 (°C) |
| Density 20,25 (g/cm 3 ) |
| Electronegativity: 1,2 |
| Oxidation number: III,IV |
| Number of neutrons: 144 |
| Crystal structure: Orthorhombic |
| Chemical serie: Rare earth elements |
| Color: ----- |
| Electron configuration: 2-8-18-32-23-8-2 |
| Year of discovery:: 1940 |
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Update: 26.11.25
Update: 26.11.25