Periodic Table of the Elements: Neptunium
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| Atomic Number: | 93 |
| Atomic Symbol: | Np |
| Neptuniumneptunium , radioactive chemical element; symbol Np; at. no. 93; mass number of most stable isotope 237; m.p. about 640°C;; b.p. 3,902°C; (estimated); sp. gr. 20.25 at 20°C;; valence +3, +4, +5, or +6. Neptunium is a ductile, silvery radioactive metal. ..... Click the link for more information. | |
| Atomic Weight: | (237) |
| Electron Configuration: | 2 · 8 · 18 32 · 22 9 · 2 |