Rutherfordium (Rf, Z = 104)
104
Rf
267,000 u
Métal de transition Bloc d Groupe 4 Période 7 Solide (CNTP)
Rutherfordium is a chemical element with symbol Rf and atomic number 104, named in honor of physicist Ernest Rutherford. 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, 267Rf, has a half-life of approximately 1.3 hours. In the periodic table of the elements, it is a d - block element and the second of the fourth - row transition elements.
Découvreur : Joint Institute for Nuclear Research
Propriétés physiques
- Masse atomique standard
- 267,0 u
- Densité
- 23,20 g/cm³
- Point de fusion
- 2 400,0 K
- Point d'ébullition
- 5 800,0 K
- Chaleur molaire
- —
- Électronégativité (Pauling)
- —
- Affinité électronique
- —
- Énergies d'ionisation
- 580 kJ/mol
- Configuration électronique
- [Rn] 5f14 6d2 7s2
- Électrons par couche
- K : 2 · L : 8 · M : 18 · N : 32 · O : 32 · P : 10 · Q : 2
Isotopes (16)
| Nucléide | A | N | Masse (u) | Abondance (%) | Demi-vie | Spin | Parité | Magique |
|---|---|---|---|---|---|---|---|---|
| 253Rf | 253 | 149 | 253,100528 | — | 13 ms | 7/2 | — | |
| 254Rf | 254 | 150 | 254,100055 | — | 22.9 µs | 0 | ⁺ | — |
| 255Rf | 255 | 151 | 255,101267 | — | 1.63 s | 9/2 | ⁻ | — |
| 256Rf | 256 | 152 | 256,101151 | — | 6.6 ms | 0 | ⁺ | — |
| 257Rf | 257 | 153 | 257,102917 | — | 5 s | 1/2 | ⁺ | — |
| 258Rf | 258 | 154 | 258,103430 | — | 12.5 ms | 0 | ⁺ | — |
| 259Rf | 259 | 155 | 259,105601 | — | 2.63 s | 3/2 | ⁺ | — |
| 260Rf | 260 | 156 | 260,106440 | — | 21 ms | 0 | ⁺ | — |
| 261Rf | 261 | 157 | 261,108770 | — | 2.1 s | 3/2 | ⁺ | — |
| 262Rf | 262 | 158 | 262,109923 | — | 250 ms | 0 | ⁺ | — |
| 263Rf | 263 | 159 | 263,112461 | — | 11 min | — | — | |
| 264Rf | 264 | 160 | 264,113876 | — | — | 0 | ⁺ | — |
| 265Rf | 265 | 161 | 265,116683 | — | 1.6 min | 9/2 | ⁺ | — |
| 266Rf | 266 | 162 | 266,118236 | — | — | 0 | ⁺ | — |
| 267Rf | 267 | 163 | 267,121787 | — | 2.5 h | — | — | |
| 268Rf | 268 | 164 | 268,123968 | — | — | 0 | ⁺ | — |
Liseré coloré en première colonne : vert = stable, jaune = demi-vie > 1 an, orange > 1 jour, rouge < 1 jour.