Samarium (Sm, Z = 62)
Lanthanide Bloc f Groupe 3 Période 6 Solide (CNTP)
Samarium is a chemical element with symbol Sm and atomic number 62. It is a moderately hard silvery metal that readily oxidizes in air. Being a typical member of the lanthanide series, samarium usually assumes the oxidation state +3.
Découvreur : Lecoq de Boisbaudran
Propriétés physiques
- Masse atomique standard
- 150,4 u
- Densité
- 7,520 g/cm³
- Point de fusion
- 1 345,0 K
- Point d'ébullition
- 2 173,0 K
- Chaleur molaire
- 29,54 J·mol⁻¹·K⁻¹
- Électronégativité (Pauling)
- 1,170
- Affinité électronique
- 15,63 kJ/mol
- Énergies d'ionisation
- 545 ; 1 070 ; 2 260 ; 3 990 kJ/mol
- Configuration électronique
- [Xe] 4f6 6s2
- Électrons par couche
- K : 2 · L : 8 · M : 18 · N : 24 · O : 8 · P : 2
- Aspect
- silvery white
Correspondance ANU historique / conjectural
Comptage de la Chimie Occulte (1908) : 2 794 ANU (atomes ultimes), soit N/18 = 155,22 — masse « noologique » à comparer à la masse standard 150,362 u et à l'isotope dominant 152Sm. Coefficient k(Z) = 0,935
Matériel historique et conjectural — voir la page Pont ANU ↔ Nucléides.
Isotopes (41)
| Nucléide | A | N | Masse (u) | Abondance (%) | Demi-vie | Spin | Parité | Magique |
|---|---|---|---|---|---|---|---|---|
| 128Sm | 128 | 66 | 127,957971 | — | — | 0 | ⁺ | — |
| 129Sm | 129 | 67 | 128,954557 | — | 550 ms | 1/2 | ⁺ | — |
| 130Sm | 130 | 68 | 129,948792 | — | — | 0 | ⁺ | — |
| 131Sm | 131 | 69 | 130,946022 | — | 1.2 s | 5/2 | ⁺ | — |
| 132Sm | 132 | 70 | 131,940805 | — | 4 s | 0 | ⁺ | — |
| 133Sm | 133 | 71 | 132,938560 | — | 2.89 s | 5/2 | ⁺ | — |
| 134Sm | 134 | 72 | 133,934110 | — | 9.5 s | 0 | ⁺ | — |
| 135Sm | 135 | 73 | 134,932520 | — | 10.3 s | 7/2 | ⁺ | — |
| 136Sm | 136 | 74 | 135,928276 | — | 47 s | 0 | ⁺ | — |
| 137Sm | 137 | 75 | 136,927008 | — | 45 s | 9/2 | ⁻ | — |
| 138Sm | 138 | 76 | 137,923244 | — | 3.1 min | 0 | ⁺ | — |
| 139Sm | 139 | 77 | 138,922297 | — | 2.57 min | 1/2 | ⁺ | — |
| 140Sm | 140 | 78 | 139,918995 | — | 14.82 min | 0 | ⁺ | — |
| 141Sm | 141 | 79 | 140,918482 | — | 10.2 min | 1/2 | ⁺ | — |
| 142Sm | 142 | 80 | 141,915209 | — | 72.49 min | 0 | ⁺ | — |
| 143Sm | 143 | 81 | 142,914635 | — | 8.75 min | 3/2 | ⁺ | — |
| 144Sm | 144 | 82 | 143,912006 | 3,0800 | stable | 0 | ⁺ | N magique |
| 145Sm | 145 | 83 | 144,913417 | — | 340 j | 7/2 | ⁻ | — |
| 146Sm | 146 | 84 | 145,913047 | — | 68 Ma | 0 | ⁺ | — |
| 147Sm | 147 | 85 | 146,914904 | 15,0000 | 106.6 Ga | 7/2 | ⁻ | — |
| 148Sm | 148 | 86 | 147,914829 | 11,2500 | 6.3 Pa | 0 | ⁺ | — |
| 149Sm | 149 | 87 | 148,917191 | 13,8200 | stable | 7/2 | ⁻ | — |
| 150Sm | 150 | 88 | 149,917282 | 7,3700 | stable | 0 | ⁺ | — |
| 151Sm | 151 | 89 | 150,919939 | — | 94.6 an | 5/2 | ⁻ | — |
| 152Sm | 152 | 90 | 151,919739 | 26,7400 | stable | 0 | ⁺ | — |
| 153Sm | 153 | 91 | 152,922104 | — | 46.2846 h | 3/2 | ⁺ | — |
| 154Sm | 154 | 92 | 153,922216 | 22,7400 | stable | 0 | ⁺ | — |
| 155Sm | 155 | 93 | 154,924647 | — | 22.18 min | 3/2 | ⁻ | — |
| 156Sm | 156 | 94 | 155,925538 | — | 9.4 h | 0 | ⁺ | — |
| 157Sm | 157 | 95 | 156,928419 | — | 8.03 min | 3/2 | ⁻ | — |
| 158Sm | 158 | 96 | 157,929949 | — | 5.3 min | 0 | ⁺ | — |
| 159Sm | 159 | 97 | 158,933217 | — | 11.37 s | 5/2 | ⁻ | — |
| 160Sm | 160 | 98 | 159,935337 | — | 9.6 s | 0 | ⁺ | — |
| 161Sm | 161 | 99 | 160,939160 | — | 4.8 s | 7/2 | ⁺ | — |
| 162Sm | 162 | 100 | 161,941622 | — | 2.7 s | 0 | ⁺ | — |
| 163Sm | 163 | 101 | 162,945679 | — | 1.3 s | 1/2 | ⁻ | — |
| 164Sm | 164 | 102 | 163,948550 | — | 1.43 s | 0 | ⁺ | — |
| 165Sm | 165 | 103 | 164,953290 | — | 980 ms | 5/2 | ⁻ | — |
| 166Sm | 166 | 104 | 165,956575 | — | 800 ms | 0 | ⁺ | — |
| 167Sm | 167 | 105 | 166,962072 | — | — | 7/2 | ⁻ | — |
| 168Sm | 168 | 106 | 167,966033 | — | — | 0 | ⁺ | — |
Liseré coloré en première colonne : vert = stable, jaune = demi-vie > 1 an, orange > 1 jour, rouge < 1 jour.