111Rg282.169
Roentgenium
Transition Metal
Expected to be a Solid at STP
Period 7Group 11Block DDiscovered 1994
[Rn]7s2 5f14 6d9 (predicted)
Roentgenium is a chemical element with symbol Rg and atomic number 111. It is an extremely radioactive synthetic element (an element that can be created in a laboratory but is not found in nature); the most stable known isotope, roentgenium-282, has a half-life of 2.1 minutes. Roentgenium was first created in 1994 by the GSI Helmholtz Centre for Heavy Ion Research near Darmstadt, Germany.
📖 Read more on Wikipedia →Atomic Properties
| Atomic Number | 111 |
| Atomic Mass | 282.169 u |
| Electron Configuration | [Rn]7s2 5f14 6d9 (predicted) |
| Oxidation States | 5, 3, 1, -1 |
| Block | D |
Physical Properties
| Standard State | Expected to be a Solid |
Classification
| Category | Transition Metal |
| Group Block | Transition metal |
| Period | 7 |
| Group | 11 |
| Block | D |
Discovery
| Year Discovered | 1994 |
| Discovered By | Gesellschaft für Schwerionenforschung |
| Electron Shells | 2, 8, 18, 32, 32, 17, 2 |