Cérium (Ce, Z = 58)
Lanthanide Bloc f Groupe 3 Période 6 Solide (CNTP)
Cerium is a chemical element with symbol Ce and atomic number 58. It is a soft, silvery, ductile metal which easily oxidizes in air. Cerium was named after the dwarf planet Ceres (itself named after the Roman goddess of agriculture).
Découvreur : Martin Heinrich Klaproth
Propriétés physiques
- Masse atomique standard
- 140,1 u
- Densité
- 6,770 g/cm³
- Point de fusion
- 1 068,0 K
- Point d'ébullition
- 3 716,0 K
- Chaleur molaire
- 26,94 J·mol⁻¹·K⁻¹
- Électronégativité (Pauling)
- 1,120
- Affinité électronique
- 55,00 kJ/mol
- Énergies d'ionisation
- 534 ; 1 050 ; 1 949 ; 3 547 kJ/mol
- Configuration électronique
- [Xe] 4f1 5d1 6s2
- Électrons par couche
- K : 2 · L : 8 · M : 18 · N : 19 · O : 9 · P : 2
- Aspect
- silvery white
Correspondance ANU historique / conjectural
Comptage de la Chimie Occulte (1908) : 2 511 ANU (atomes ultimes), soit N/18 = 139,50 — masse « noologique » à comparer à la masse standard 140,116 u et à l'isotope dominant 140Ce. Coefficient k(Z) = 0,944
Matériel historique et conjectural — voir la page Pont ANU ↔ Nucléides.
Isotopes (41)
| Nucléide | A | N | Masse (u) | Abondance (%) | Demi-vie | Spin | Parité | Magique |
|---|---|---|---|---|---|---|---|---|
| 119Ce | 119 | 61 | 118,952957 | — | — | 5/2 | ⁺ | — |
| 120Ce | 120 | 62 | 119,946613 | — | — | 0 | ⁺ | — |
| 121Ce | 121 | 63 | 120,943435 | — | 1.1 s | 5/2 | — | |
| 122Ce | 122 | 64 | 121,937870 | — | — | 0 | ⁺ | — |
| 123Ce | 123 | 65 | 122,935280 | — | 3.8 s | 5/2 | — | |
| 124Ce | 124 | 66 | 123,930310 | — | 9.1 s | 0 | ⁺ | — |
| 125Ce | 125 | 67 | 124,928440 | — | 9.7 s | 7/2 | ⁻ | — |
| 126Ce | 126 | 68 | 125,923971 | — | 51 s | 0 | ⁺ | — |
| 127Ce | 127 | 69 | 126,922727 | — | 34 s | 1/2 | ⁺ | — |
| 128Ce | 128 | 70 | 127,918911 | — | 3.93 min | 0 | ⁺ | — |
| 129Ce | 129 | 71 | 128,918102 | — | 3.5 min | 5/2 | ⁺ | — |
| 130Ce | 130 | 72 | 129,914736 | — | 22.9 min | 0 | ⁺ | — |
| 131Ce | 131 | 73 | 130,914429 | — | 10.3 min | 7/2 | ⁺ | — |
| 132Ce | 132 | 74 | 131,911466 | — | 3.51 h | 0 | ⁺ | — |
| 133Ce | 133 | 75 | 132,911520 | — | 97 min | 1/2 | ⁺ | — |
| 134Ce | 134 | 76 | 133,908928 | — | 3.16 j | 0 | ⁺ | — |
| 135Ce | 135 | 77 | 134,909161 | — | 17.7 h | 1/2 | ⁺ | — |
| 136Ce | 136 | 78 | 135,907129 | 0,1860 | stable | 0 | ⁺ | — |
| 137Ce | 137 | 79 | 136,907762 | — | 9 h | 3/2 | ⁺ | — |
| 138Ce | 138 | 80 | 137,905994 | 0,2510 | stable | 0 | ⁺ | — |
| 139Ce | 139 | 81 | 138,906647 | — | 137.642 j | 3/2 | ⁺ | — |
| 140Ce | 140 | 82 | 139,905448 | 88,4490 | stable | 0 | ⁺ | N magique |
| 141Ce | 141 | 83 | 140,908286 | — | 32.505 j | 7/2 | ⁻ | — |
| 142Ce | 142 | 84 | 141,909250 | 11,1140 | stable | 0 | ⁺ | — |
| 143Ce | 143 | 85 | 142,912392 | — | 33.039 h | 3/2 | ⁻ | — |
| 144Ce | 144 | 86 | 143,913653 | — | 284.886 j | 0 | ⁺ | — |
| 145Ce | 145 | 87 | 144,917265 | — | 3.01 min | 5/2 | ⁻ | — |
| 146Ce | 146 | 88 | 145,918812 | — | 13.49 min | 0 | ⁺ | — |
| 147Ce | 147 | 89 | 146,922690 | — | 56.4 s | 5/2 | ⁻ | — |
| 148Ce | 148 | 90 | 147,924424 | — | 56.8 s | 0 | ⁺ | — |
| 149Ce | 149 | 91 | 148,928427 | — | 4.94 s | 3/2 | ⁻ | — |
| 150Ce | 150 | 92 | 149,930384 | — | 6.05 s | 0 | ⁺ | — |
| 151Ce | 151 | 93 | 150,934272 | — | 1.76 s | 3/2 | ⁻ | — |
| 152Ce | 152 | 94 | 151,936682 | — | 1.42 s | 0 | ⁺ | — |
| 153Ce | 153 | 95 | 152,941052 | — | 865 ms | 3/2 | ⁻ | — |
| 154Ce | 154 | 96 | 153,943940 | — | 722 ms | 0 | ⁺ | — |
| 155Ce | 155 | 97 | 154,948706 | — | 313 ms | 5/2 | ⁻ | — |
| 156Ce | 156 | 98 | 155,951884 | — | 233 ms | 0 | ⁺ | — |
| 157Ce | 157 | 99 | 156,957133 | — | 175 ms | 7/2 | ⁺ | — |
| 158Ce | 158 | 100 | 157,960773 | — | 99 ms | 0 | ⁺ | — |
| 159Ce | 159 | 101 | 158,966355 | — | stable | 1/2 | ⁻ | — |
Liseré coloré en première colonne : vert = stable, jaune = demi-vie > 1 an, orange > 1 jour, rouge < 1 jour.