Protactinium is a chemical element from the periodic table. It is a silvery-white metal that is found in uranium ores and is very rare in the Earth's crust. Protactinium is used in some nuclear reactors as a source of neutrons and in the production of nuclear weapons.
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| Atomic number | 91 |
| Group | VB |
| Period | 7 |
| Mass | 231.03587 |
| Latin name | Protactinium |
| Electron configuration | [Rn]5f2 6d7s2 |
| Oxidation state | 0, 2, 3, 4, 5 |