Roentgénium (Rg, Z = 111)
111
Rg
282,000 u
Indéterminé Bloc d Groupe 11 Période 7 Solide (CNTP)
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.
Découvreur : Gesellschaft für Schwerionenforschung
Propriétés physiques
- Masse atomique standard
- 282,0 u
- Densité
- 28,70 g/cm³
- Point de fusion
- —
- Point d'ébullition
- —
- Chaleur molaire
- —
- Électronégativité (Pauling)
- —
- Affinité électronique
- 151,0 kJ/mol
- Énergies d'ionisation
- —
- Configuration électronique
- *[Rn] 5f14 6d10 7s1
- Électrons par couche
- K : 2 · L : 8 · M : 18 · N : 32 · O : 32 · P : 17 · Q : 2
Isotopes (15)
| Nucléide | A | N | Masse (u) | Abondance (%) | Demi-vie | Spin | Parité | Magique |
|---|---|---|---|---|---|---|---|---|
| 272Rg | 272 | 161 | 272,153273 | — | 4.2 ms | — | — | |
| 273Rg | 273 | 162 | 273,153393 | — | — | — | — | |
| 274Rg | 274 | 163 | 274,155247 | — | 20 ms | — | — | |
| 275Rg | 275 | 164 | 275,156088 | — | — | — | — | |
| 276Rg | 276 | 165 | 276,158226 | — | — | — | — | |
| 277Rg | 277 | 166 | 277,159322 | — | — | — | — | |
| 278Rg | 278 | 167 | 278,161590 | — | 8 ms | — | — | |
| 279Rg | 279 | 168 | 279,162880 | — | 170 ms | — | — | |
| 280Rg | 280 | 169 | 280,165204 | — | 4.3 s | — | — | |
| 281Rg | 281 | 170 | 281,166757 | — | 19 s | — | — | |
| 282Rg | 282 | 171 | 282,169343 | — | 130 s | — | — | |
| 283Rg | 283 | 172 | 283,171101 | — | — | — | — | |
| 284Rg | 284 | 173 | 284,173882 | — | — | — | — | |
| 285Rg | 285 | 174 | 285,175771 | — | — | — | — | |
| 286Rg | 286 | 175 | 286,178756 | — | — | — | — |
Liseré coloré en première colonne : vert = stable, jaune = demi-vie > 1 an, orange > 1 jour, rouge < 1 jour.