Arsenic (As, Z = 33)
33
As
74,922 u
Métalloïde Bloc p Groupe 15 Période 4 Solide (CNTP)
Arsenic is a chemical element with symbol As and atomic number 33. Arsenic occurs in many minerals, usually in conjunction with sulfur and metals, and also as a pure elemental crystal. Arsenic is a metalloid.
Découvreur : Bronze Age
Propriétés physiques
- Masse atomique standard
- 74,92 u
- Densité
- 5,727 g/cm³
- Point de fusion
- —
- Point d'ébullition
- —
- Chaleur molaire
- 24,64 J·mol⁻¹·K⁻¹
- Électronégativité (Pauling)
- 2,180
- Affinité électronique
- 77,65 kJ/mol
- Énergies d'ionisation
- 947 ; 1 798 ; 2 735 ; 4 837 kJ/mol
- Configuration électronique
- [Ar] 3d10 4s2 4p3
- Électrons par couche
- K : 2 · L : 8 · M : 18 · N : 5
- Aspect
- metallic grey
Correspondance ANU historique / conjectural
Comptage de la Chimie Occulte (1908) : 1 350 ANU (atomes ultimes), soit N/18 = 75,00 — masse « noologique » à comparer à la masse standard 74,922 u et à l'isotope dominant 75As. Coefficient k(Z) = 1,021 · multiple de 18
Matériel historique et conjectural — voir la page Pont ANU ↔ Nucléides.
Isotopes (33)
| Nucléide | A | N | Masse (u) | Abondance (%) | Demi-vie | Spin | Parité | Magique |
|---|---|---|---|---|---|---|---|---|
| 60As | 60 | 27 | 59,993945 | — | stable | 5 | ⁺ | — |
| 61As | 61 | 28 | 60,981535 | — | stable | 3/2 | ⁻ | N magique |
| 62As | 62 | 29 | 61,973784 | — | stable | 1 | ⁺ | — |
| 63As | 63 | 30 | 62,964036 | — | stable | 3/2 | ⁻ | — |
| 64As | 64 | 31 | 63,957560 | — | 69 ms | 0 | ⁺ | — |
| 65As | 65 | 32 | 64,949611 | — | 130.3 ms | 3/2 | ⁻ | — |
| 66As | 66 | 33 | 65,944149 | — | 95.77 ms | 0 | ⁺ | — |
| 67As | 67 | 34 | 66,939251 | — | 42.5 s | 5/2 | ⁻ | — |
| 68As | 68 | 35 | 67,936774 | — | 151.6 s | 3 | ⁺ | — |
| 69As | 69 | 36 | 68,932246 | — | 15.2 min | 5/2 | ⁻ | — |
| 70As | 70 | 37 | 69,930935 | — | 52.6 min | 4 | ⁺ | — |
| 71As | 71 | 38 | 70,927114 | — | 65.3 h | 5/2 | ⁻ | — |
| 72As | 72 | 39 | 71,926752 | — | 26 h | 2 | ⁻ | — |
| 73As | 73 | 40 | 72,923829 | — | 80.3 j | 3/2 | ⁻ | — |
| 74As | 74 | 41 | 73,923929 | — | 17.77 j | 2 | ⁻ | — |
| 75As | 75 | 42 | 74,921595 | 100,0000 | stable | 3/2 | ⁻ | — |
| 76As | 76 | 43 | 75,922392 | — | 1.0933 j | 2 | ⁻ | — |
| 77As | 77 | 44 | 76,920648 | — | 38.79 h | 3/2 | ⁻ | — |
| 78As | 78 | 45 | 77,921828 | — | 90.7 min | 2 | ⁻ | — |
| 79As | 79 | 46 | 78,920948 | — | 9.01 min | 3/2 | ⁻ | — |
| 80As | 80 | 47 | 79,922474 | — | 15.2 s | 1 | ⁺ | — |
| 81As | 81 | 48 | 80,922132 | — | 33.3 s | 3/2 | ⁻ | — |
| 82As | 82 | 49 | 81,924739 | — | 19.1 s | 2 | ⁻ | — |
| 83As | 83 | 50 | 82,925207 | — | 13.4 s | 5/2 | ⁻ | N magique |
| 84As | 84 | 51 | 83,929303 | — | 3.16 s | 2 | ⁻ | — |
| 85As | 85 | 52 | 84,932164 | — | 2.022 s | 5/2 | ⁻ | — |
| 86As | 86 | 53 | 85,936702 | — | 945 ms | 1 | ⁻ | — |
| 87As | 87 | 54 | 86,940292 | — | 492 ms | 5/2 | ⁻ | — |
| 88As | 88 | 55 | 87,945840 | — | 270 ms | — | — | |
| 89As | 89 | 56 | 88,950048 | — | — | 5/2 | ⁻ | — |
| 90As | 90 | 57 | 89,955995 | — | — | — | — | |
| 91As | 91 | 58 | 90,960816 | — | — | 5/2 | ⁻ | — |
| 92As | 92 | 59 | 91,967386 | — | — | — | — |
Liseré coloré en première colonne : vert = stable, jaune = demi-vie > 1 an, orange > 1 jour, rouge < 1 jour.