| Roentgenium [Rg] (CAS-ID: 54386-24-2) | |
| An: 111 N: 161 Am: [ 272 ] | |
| Group No: 11 Group Name: none. | |
| Block: d-block Period: 7 | |
| State: presumably a solid at 298 K | |
| Colour: Unknown, but probably metallic and silvery white or grey in appearance. Man made radioactive metal. Classification: Metallic | |
| Boiling Point: unknown (?) | |
| Melting Point: unknown (?) | |
| Density: unknown | |
| Availability: Roentgenium is not commercially available | |
 Discovery Information |
| Who: GSI |
| When: 1994 |
| Where: Darmstadt, West Germany |
| Name Origin |
| Sources |
| 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. |
| Uses |
| None. |
| Notes |
| The name was accepted as permanent on November 1st 2004. |
| Element 111 was previously known as Unununium; from the latin for "one one one". |