Fer (Fe, Z = 26)
Métal de transition Bloc d Groupe 8 Période 4 Solide (CNTP)
Iron is a chemical element with symbol Fe (from Latin:ferrum) and atomic number 26. It is a metal in the first transition series. It is by mass the most common element on Earth, forming much of Earth's outer and inner core.
Découvreur : 5000 BC
Propriétés physiques
- Masse atomique standard
- 55,85 u
- Densité
- 7,874 g/cm³
- Point de fusion
- 1 811,0 K
- Point d'ébullition
- 3 134,0 K
- Chaleur molaire
- 25,10 J·mol⁻¹·K⁻¹
- Électronégativité (Pauling)
- 1,830
- Affinité électronique
- 14,79 kJ/mol
- Énergies d'ionisation
- 763 ; 1 562 ; 2 957 ; 5 290 kJ/mol
- Configuration électronique
- [Ar] 3d6 4s2
- Électrons par couche
- K : 2 · L : 8 · M : 14 · N : 2
- Aspect
- lustrous metallic with a grayish tinge
Correspondance ANU historique / conjectural
Comptage de la Chimie Occulte (1908) : 1 008 ANU (atomes ultimes), soit N/18 = 56,00 — masse « noologique » à comparer à la masse standard 55,845 u et à l'isotope dominant 56Fe. Coefficient k(Z) = 1,054 · multiple de 18
Matériel historique et conjectural — voir la page Pont ANU ↔ Nucléides.
Isotopes (32)
| Nucléide | A | N | Masse (u) | Abondance (%) | Demi-vie | Spin | Parité | Magique |
|---|---|---|---|---|---|---|---|---|
| 45Fe | 45 | 19 | 45,015467 | — | 2.5 ms | 3/2 | ⁺ | — |
| 46Fe | 46 | 20 | 46,001299 | — | 13 ms | 0 | ⁺ | N magique |
| 47Fe | 47 | 21 | 46,992346 | — | 21.9 ms | 7/2 | ⁻ | — |
| 48Fe | 48 | 22 | 47,980667 | — | 45.3 ms | 0 | ⁺ | — |
| 49Fe | 49 | 23 | 48,973429 | — | 64.7 ms | 7/2 | ⁻ | — |
| 50Fe | 50 | 24 | 49,962988 | — | 152 ms | 0 | ⁺ | — |
| 51Fe | 51 | 25 | 50,956855 | — | 305.4 ms | 5/2 | ⁻ | — |
| 52Fe | 52 | 26 | 51,948113 | — | 8.275 h | 0 | ⁺ | — |
| 53Fe | 53 | 27 | 52,945306 | — | 8.51 min | 7/2 | ⁻ | — |
| 54Fe | 54 | 28 | 53,939608 | 5,8450 | stable | 0 | ⁺ | N magique |
| 55Fe | 55 | 29 | 54,938291 | — | 2.7562 an | 3/2 | ⁻ | — |
| 56Fe | 56 | 30 | 55,934936 | 91,7540 | stable | 0 | ⁺ | — |
| 57Fe | 57 | 31 | 56,935392 | 2,1190 | stable | 1/2 | ⁻ | — |
| 58Fe | 58 | 32 | 57,933274 | 0,2820 | stable | 0 | ⁺ | — |
| 59Fe | 59 | 33 | 58,934873 | — | 44.5 j | 3/2 | ⁻ | — |
| 60Fe | 60 | 34 | 59,934070 | — | 2.62 Ma | 0 | ⁺ | — |
| 61Fe | 61 | 35 | 60,936746 | — | 5.98 min | 3/2 | ⁻ | — |
| 62Fe | 62 | 36 | 61,936792 | — | 68 s | 0 | ⁺ | — |
| 63Fe | 63 | 37 | 62,940273 | — | 6.1 s | 5/2 | ⁻ | — |
| 64Fe | 64 | 38 | 63,940988 | — | 2 s | 0 | ⁺ | — |
| 65Fe | 65 | 39 | 64,945015 | — | 805 ms | 1/2 | ⁻ | — |
| 66Fe | 66 | 40 | 65,946250 | — | 467 ms | 0 | ⁺ | — |
| 67Fe | 67 | 41 | 66,950930 | — | 394 ms | 1/2 | ⁻ | — |
| 68Fe | 68 | 42 | 67,952875 | — | 188 ms | 0 | ⁺ | — |
| 69Fe | 69 | 43 | 68,957918 | — | 162 ms | 1/2 | ⁻ | — |
| 70Fe | 70 | 44 | 69,960397 | — | 61.4 ms | 0 | ⁺ | — |
| 71Fe | 71 | 45 | 70,965722 | — | 34.3 ms | 7/2 | ⁺ | — |
| 72Fe | 72 | 46 | 71,968599 | — | 17 ms | 0 | ⁺ | — |
| 73Fe | 73 | 47 | 72,974246 | — | 12.9 ms | 7/2 | ⁺ | — |
| 74Fe | 74 | 48 | 73,977821 | — | 5 ms | 0 | ⁺ | — |
| 75Fe | 75 | 49 | 74,984219 | — | — | 9/2 | ⁺ | — |
| 76Fe | 76 | 50 | 75,988631 | — | — | 0 | ⁺ | N magique |
Liseré coloré en première colonne : vert = stable, jaune = demi-vie > 1 an, orange > 1 jour, rouge < 1 jour.