Néodyme (Nd, Z = 60)
60
Nd
144,242 u
Lanthanide Bloc f Groupe 3 Période 6 Solide (CNTP)
Neodymium is a chemical element with symbol Nd and atomic number 60. It is a soft silvery metal that tarnishes in air. Neodymium was discovered in 1885 by the Austrian chemist Carl Auer von Welsbach.
Découvreur : Carl Auer von Welsbach
Propriétés physiques
- Masse atomique standard
- 144,2 u
- Densité
- 7,010 g/cm³
- Point de fusion
- 1 297,0 K
- Point d'ébullition
- 3 347,0 K
- Chaleur molaire
- 27,45 J·mol⁻¹·K⁻¹
- Électronégativité (Pauling)
- 1,140
- Affinité électronique
- 184,9 kJ/mol
- Énergies d'ionisation
- 533 ; 1 040 ; 2 130 ; 3 900 kJ/mol
- Configuration électronique
- [Xe] 4f4 6s2
- Électrons par couche
- K : 2 · L : 8 · M : 18 · N : 22 · O : 8 · P : 2
- Aspect
- silvery white
Correspondance ANU historique / conjectural
Comptage de la Chimie Occulte (1908) : 2 575 ANU (atomes ultimes), soit N/18 = 143,06 — masse « noologique » à comparer à la masse standard 144,242 u et à l'isotope dominant 142Nd. Coefficient k(Z) = 0,939
Matériel historique et conjectural — voir la page Pont ANU ↔ Nucléides.
Isotopes (40)
| Nucléide | A | N | Masse (u) | Abondance (%) | Demi-vie | Spin | Parité | Magique |
|---|---|---|---|---|---|---|---|---|
| 124Nd | 124 | 64 | 123,951873 | — | — | 0 | ⁺ | — |
| 125Nd | 125 | 65 | 124,948395 | — | 650 ms | 5/2 | — | |
| 126Nd | 126 | 66 | 125,942694 | — | — | 0 | ⁺ | — |
| 127Nd | 127 | 67 | 126,939978 | — | 1.8 s | 5/2 | ⁺ | — |
| 128Nd | 128 | 68 | 127,935018 | — | — | 0 | ⁺ | — |
| 129Nd | 129 | 69 | 128,933038 | — | 6.8 s | 7/2 | ⁻ | — |
| 130Nd | 130 | 70 | 129,928506 | — | 21 s | 0 | ⁺ | — |
| 131Nd | 131 | 71 | 130,927248 | — | 25.4 s | 5/2 | ⁺ | — |
| 132Nd | 132 | 72 | 131,923321 | — | 1.56 min | 0 | ⁺ | — |
| 133Nd | 133 | 73 | 132,922348 | — | 70 s | 7/2 | ⁺ | — |
| 134Nd | 134 | 74 | 133,918790 | — | 8.5 min | 0 | ⁺ | — |
| 135Nd | 135 | 75 | 134,918181 | — | 12.4 min | 9/2 | ⁻ | — |
| 136Nd | 136 | 76 | 135,914976 | — | 50.65 min | 0 | ⁺ | — |
| 137Nd | 137 | 77 | 136,914563 | — | 38.5 min | 1/2 | ⁺ | — |
| 138Nd | 138 | 78 | 137,911951 | — | 5.04 h | 0 | ⁺ | — |
| 139Nd | 139 | 79 | 138,911951 | — | 29.7 min | 3/2 | ⁺ | — |
| 140Nd | 140 | 80 | 139,909546 | — | 3.37 j | 0 | ⁺ | — |
| 141Nd | 141 | 81 | 140,909617 | — | 2.49 h | 3/2 | ⁺ | — |
| 142Nd | 142 | 82 | 141,907729 | 27,1530 | stable | 0 | ⁺ | N magique |
| 143Nd | 143 | 83 | 142,909820 | 12,1730 | stable | 7/2 | ⁻ | — |
| 144Nd | 144 | 84 | 143,910093 | 23,7980 | 2.29 Pa | 0 | ⁺ | — |
| 145Nd | 145 | 85 | 144,912579 | 8,2930 | stable | 7/2 | ⁻ | — |
| 146Nd | 146 | 86 | 145,913122 | 17,1890 | stable | 0 | ⁺ | — |
| 147Nd | 147 | 87 | 146,916106 | — | 10.98 j | 5/2 | ⁻ | — |
| 148Nd | 148 | 88 | 147,916899 | 5,7560 | stable | 0 | ⁺ | — |
| 149Nd | 149 | 89 | 148,920155 | — | 1.728 h | 5/2 | ⁻ | — |
| 150Nd | 150 | 90 | 149,920901 | 5,6380 | 9.3 Eyear | 0 | ⁺ | — |
| 151Nd | 151 | 91 | 150,923839 | — | 12.44 min | 3/2 | ⁺ | — |
| 152Nd | 152 | 92 | 151,924691 | — | 11.4 min | 0 | ⁺ | — |
| 153Nd | 153 | 93 | 152,927718 | — | 31.6 s | 3/2 | — | |
| 154Nd | 154 | 94 | 153,929597 | — | 25.9 s | 0 | ⁺ | — |
| 155Nd | 155 | 95 | 154,933136 | — | 8.9 s | 3/2 | ⁻ | — |
| 156Nd | 156 | 96 | 155,935370 | — | 5.06 s | 0 | ⁺ | — |
| 157Nd | 157 | 97 | 156,939351 | — | 1.15 s | 5/2 | ⁻ | — |
| 158Nd | 158 | 98 | 157,942206 | — | 810 ms | 0 | ⁺ | — |
| 159Nd | 159 | 99 | 158,946619 | — | 500 ms | 7/2 | ⁺ | — |
| 160Nd | 160 | 100 | 159,949839 | — | 439 ms | 0 | ⁺ | — |
| 161Nd | 161 | 101 | 160,954664 | — | 215 ms | 1/2 | ⁻ | — |
| 162Nd | 162 | 102 | 161,958121 | — | 310 ms | 0 | ⁺ | — |
| 163Nd | 163 | 103 | 162,963414 | — | — | 5/2 | ⁻ | — |
Liseré coloré en première colonne : vert = stable, jaune = demi-vie > 1 an, orange > 1 jour, rouge < 1 jour.