 Discovery Information
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| Who: GSI |
| When: 1994 |
| Where: Darmstadt, West Germany |
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| Name Origin
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| The name roentgenium was accepted as a permanent name on November 1, 2004 in honour of Wilhelm Rontgen; before this date,
the element was known under the temporary IUPAC systematic element name "unununium".
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| "Roentgenium" in different languages. |
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| Sources
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| Only a few atoms of element 111 have ever been made through a nuclear reaction involving fusion of an isotope of bismuth, 209Bi, with one of nickel, 64Ni. Isolation of an observable quantity has never been achieved, and may well never be.
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| Uses
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| None. |
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| History
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| It was discovered by Peter Armbruster, Gottfried Münzenberg, and their team working at the Gesellschaft für Schwerionenforschung (GSI) in Darmstadt, Germany on December 8, 1994. Only three atoms of it were observed (all 272Rg), by the fusion of bismuth-209 and nickel-64 in a linear accelerator (nickel was bombarded onto the bismuth target).
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| Notes
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| Element 111 was previously known as Unununium; from the latin for "one one one", and also eka-gold. |
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| Hazards
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| Roentgenium is radioactive. |
