Roentgenium is a synthetic chemical element from the periodic table. It is a rare, silvery-white metal that was first created in 1994 through nuclear bombardment of bismuth. Roentgenium has no commercial applications, but it is used in scientific research to study atomic properties and in the production of transuranic elements.
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| Atomic number | 111 |
| Group | IB |
| Period | 7 |
| Mass | 281.16 |
| Latin name | Roentgenium |
| Electron configuration | [Rn] 7s2 5f14 6d9 |
| Oxidation state | -1, 0, 1, 3, 5 |