Hassium (Hs, Z = 108)
108
Hs
269,000 u
Métal de transition Bloc d Groupe 8 Période 7 Solide (CNTP)
Hassium is a chemical element with symbol Hs and atomic number 108, named after the German state of Hesse. It is a synthetic element (an element that can be created in a laboratory but is not found in nature) and radioactive; the most stable known isotope, 269Hs, has a half-life of approximately 9.7 seconds, although an unconfirmed metastable state, 277mHs, may have a longer half-life of about 130 seconds. More than 100 atoms of hassium have been synthesized to date.
Découvreur : Gesellschaft für Schwerionenforschung
Propriétés physiques
- Masse atomique standard
- 269,0 u
- Densité
- 40,70 g/cm³
- Point de fusion
- 126,0 K
- Point d'ébullition
- —
- Chaleur molaire
- —
- Électronégativité (Pauling)
- —
- Affinité électronique
- —
- Énergies d'ionisation
- —
- Configuration électronique
- *[Rn] 5f14 6d6 7s2
- Électrons par couche
- K : 2 · L : 8 · M : 18 · N : 32 · O : 32 · P : 14 · Q : 2
Isotopes (18)
| Nucléide | A | N | Masse (u) | Abondance (%) | Demi-vie | Spin | Parité | Magique |
|---|---|---|---|---|---|---|---|---|
| 263Hs | 263 | 155 | 263,128479 | — | 0.9 ms | 3/2 | ⁺ | — |
| 264Hs | 264 | 156 | 264,128356 | — | 0.7 s | 0 | ⁺ | — |
| 265Hs | 265 | 157 | 265,129792 | — | 1.96 ms | 3/2 | ⁺ | — |
| 266Hs | 266 | 158 | 266,130049 | — | 3 ms | 0 | ⁺ | — |
| 267Hs | 267 | 159 | 267,131678 | — | 55 ms | — | — | |
| 268Hs | 268 | 160 | 268,132011 | — | 1.4 s | 0 | ⁺ | — |
| 269Hs | 269 | 161 | 269,133649 | — | 15 s | 9/2 | ⁺ | — |
| 270Hs | 270 | 162 | 270,134313 | — | 9 s | 0 | ⁺ | — |
| 271Hs | 271 | 163 | 271,137082 | — | — | — | — | |
| 272Hs | 272 | 164 | 272,138492 | — | — | 0 | ⁺ | — |
| 273Hs | 273 | 165 | 273,141458 | — | 1060 ms | — | — | |
| 274Hs | 274 | 166 | 274,143217 | — | — | 0 | ⁺ | — |
| 275Hs | 275 | 167 | 275,146530 | — | 280 ms | — | — | |
| 276Hs | 276 | 168 | 276,148348 | — | — | 0 | ⁺ | — |
| 277Hs | 277 | 169 | 277,151772 | — | 12 ms | — | — | |
| 278Hs | 278 | 170 | 278,153753 | — | — | 0 | ⁺ | — |
| 279Hs | 279 | 171 | 279,157274 | — | — | — | — | |
| 280Hs | 280 | 172 | 280,159335 | — | — | 0 | ⁺ | — |
Liseré coloré en première colonne : vert = stable, jaune = demi-vie > 1 an, orange > 1 jour, rouge < 1 jour.