| Atomic Mass | 282 |
|---|---|
| Electron Configuration | [Rn] 7s2 5f14 6d9(predicted) |
| Oxidation States | 5, 3, 1, -1 (predicted) |
| Year Discovered | 1994 |
| Atomic Mass | 282 |
|---|---|
| Electron Configuration | [Rn] 7s2 5f14 6d9(predicted) |
| Oxidation States | 5, 3, 1, -1 (predicted) |
| Year Discovered | 1994 |
| Element Name | Roentgenium |
|---|---|
| Element Symbol | Rg |
| InChI | InChI=1S/Rg |
| InChIKey | LJROPTGWFUZRDB-UHFFFAOYSA-N |
| Atomic Weight |
281 282 Relative Mass: 280.16514(61#) |
|---|---|
| Electron Configuration |
[Rn] 7s2 5f14 6d9(predicted) |
| Atomic Radius |
Empirical Atomic Radius : empirical: 138 pm (predicted) |
| Oxidation States |
5, 3, 1, -1 (predicted) |
| Physical Description |
Expected to be a Solid |
| Element Classification |
Metal |
| Element Period Number |
7 |
| Element Group Number |
11 |
| Estimated Crustal Abundance |
Not Applicable |
| Estimated Oceanic Abundance |
Not Applicable |
Roentgenium was first produced by Peter Armbruster, Gottfried Münzenber and their team working at the Gesellschaft für Schwerionenforschung in Darmstadt, Germany in late 1994. They bombarded atoms of bismuth-209 with ions of nickel-64 with a device known as a linear accelerator. This produced three atoms of roentgenium-272, an isotope with a half-life of about 1.5 milliseconds (0.0015 seconds), and a free neutron. Roentgenium's most stable isotope, roentgenium-281, has a half-life of about 26 seconds and decays through spontaneous fission.
Discovered by Gesellschaft Schwerionenforschung (GSI) in Darmstadt, in 1994. Reasearch group of S. Hofmann, V. Ninov, F.P. Hessberger, P. Armbruster, H. Folger, G. Munzenberg, H.J. Schott, and others.
Roentgenium does not occur naturally in the Earth’s crust. Roentgenium was first synthesized by an international team of scientists from the GSI in Darmstadt, Germany, the Joint Institute for Nuclear Research (JINR) in Dubna, Russia, the Comenius University in Bratislava, Slovakia, and the University of Jyväskylä, Finland at the GSI Helmholtz Center for Heavy Ion Research in Darmstadt, Germany in 1994, using the nuclear reaction 209Bi (64Ni, n) 272Rg. The credit for the first synthesis was confirmed in 2003. The element was named after Wilhelm Conrad Roentgen (Fig. IUPAC.111.1), who discovered X-rays in 1895 [660], [661], [662]. Roentgenium has no known isotopic applications aside from scientific research.
Roentgenium is named after Wilhelm Conrad Röntgen.
Since only a few atoms of roentgenium have ever been produced, it currently has no uses outside of basic scientific research.
See more information at the Roentgenium compound page.
| CID | Name | Formula | SMILES | Molecular Weight |
|---|---|---|---|---|
| 135476786 | Rg | * | 282.169 |
| Stable Isotope Count | 0 |
|---|
| Nuclide | Atomic Mass and Uncertainty [u] | Half Life and Uncertainty | Discovery Year | Decay Modes, Intensities and Uncertainties [%] |
|---|---|---|---|---|
| 272Rg | 272.153273 ± 0.000251 [Estimated] | 4.2 ms ± 1.1 | 1995 | α=100% |
| 273Rg | 273.153393 ± 0.000429 [Estimated] | 2 ms [Estimated] | α ? | |
| 274Rg | 274.155247 ± 0.000225 [Estimated] | 20 ms ± 11 | 2004 | α≈100% |
| 275Rg | 275.156088 ± 0.000479 [Estimated] | 5 ms [Estimated] | α ? | |
| 276Rg | 276.158226 ± 0.000675 [Estimated] | 10 ms [Estimated] | α ?; SF ? | |
| 277Rg | 277.159322 ± 0.000504 [Estimated] | 4 ms [Estimated] | α ?; SF ? | |
| 278Rg | 278.161590 ± 0.000417 [Estimated] | 8 ms ± 5 | 2007 | α=100% |
| 279Rg | 279.162880 ± 0.000453 [Estimated] | 170 ms ± 110 | 2004 | α=100% |
| 280Rg | 280.165204 ± 0.000571 [Estimated] | 4.3 s ± 0.5 | 2004 | α=100% |
| 281Rg | 281.166757 ± 0.000831 [Estimated] | 19 s ± 5 | 2010 | SF=87±0.8%; α=13±0.8% |
| 282Rg | 282.169343 ± 0.000631 [Estimated] | 130 s ± 50 | 2010 | α=100% |
| 283Rg | 283.171101 ± 0.000728 [Estimated] | 2 m [Estimated] | α ?; SF ? | |
| 284Rg | 284.173882 ± 0.000537 [Estimated] | 1 m [Estimated] | α ?; SF ? | |
| 285Rg | 285.175771 ± 0.000644 [Estimated] | 30 s [Estimated] | α ?; SF ? | |
| 286Rg | 286.178756 ± 0.000492 [Estimated] | 10 s [Estimated] | 2016 | α≈100%; SF ? |
