Neptunium is a radioactive chemical element from the periodic table. It is a silvery-white metal that is found in uranium ores. Neptunium is used in nuclear reactors for power generation and in some research applications.
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| Atomic number | 93 |
| Group | VIIB |
| Period | 7 |
| Mass | 237 |
| Latin name | Neptunium |
| Electron configuration | [Rn]5f4 6d7s2 |
| Oxidation state | 0, 2, 3, 4, 5, 6, 7 |