# Isotopen van arseen

Het chemisch element arseen (As), met een atoommassa van 74,92160(2) u, bezit 1 stabiele isotoop: $^{75}$As. De overige 32 radio-isotopen zijn onstabiel en hebben een relatief korte halveringstijd (de meeste minder dan een seconde).
Vanwege het feit dat arseen maar één stabiele isotoop kent, valt het onder de mononuclidische elementen.
De kortstlevende isotoop van arseen is $^{92}$As, met een halfwaardetijd van ongeveer 30 milliseconden. De langstlevende is $^{73}$As, met een halfwaardetijd van 80 dagen.

## Overzicht

| Nuclide | Z (p) | N (n) | Isotopische massa (u) | Halveringstijd | Radioactief verval | VP | Kernspin | Isotopische verhouding (molfractie) |
| Natuurlijk voorkomen (molfractie) |||
| $^{60}$As | 33 | 27 | 59,99313(64) | | p | $^{59}$Ge | 5$^+$ | |
| $^{61}$As | 33 | 28 | 60,98062(64) | | p | $^{60}$Ge | 3/2$^−$ | |
| $^{62}$As | 33 | 29 | 61,97320(32) | | p | $^{61}$Ge | 1$^+$ | |
| $^{63}$As | 33 | 30 | 62,96369(54) | | p | $^{62}$Ge | (3/2$^−$) | |
| $^{64}$As | 33 | 31 | 63,95757(38) | 40(30) ms | β$^+$ | $^{64}$Ge | 0$^+$ | |
| $^{65}$As | 33 | 32 | 64,94956(32) | 170(30) ms | β$^+$ | $^{65}$Ge | 3/2- | |
| $^{66}$As | 33 | 33 | 65,94471(73) | 95,77(23) ms | β$^+$ | $^{66}$Ge | (0$^+$) | |
| $^{66m1}$As | 1356,70(17) keV | 1356,70(17) keV | 1356,70(17) keV | 1,1(1) µs | | | (5$^+$) | |
| $^{66m2}$As | 3023,9(3) keV | 3023,9(3) keV | 3023,9(3) keV | 8,2(5) µs | | | (9$^+$) | |
| $^{67}$As | 33 | 34 | 66,93919(11) | 42,5(12) s | β$^+$ | $^{67}$Ge | (5/2$^−$) | |
| $^{68}$As | 33 | 35 | 67,93677(5) | 151,6(8) s | β$^+$ | $^{68}$Ge | 3$^+$ | |
| $^{68m}$As | 425,21(16) keV | 425,21(16) keV | 425,21(16) keV | 111(20) s | | | 1$^+$ | |
| $^{69}$As | 33 | 36 | 68,93227(3) | 15,2(2) min | β$^+$ | $^{69}$Ge | 5/2$^−$ | |
| $^{70}$As | 33 | 37 | 69,93092(5) | 52,6(3) min | β$^+$ | $^{70}$Ge | 4$^+$ | |
| $^{70m}$As | 32,008(23) keV | 32,008(23) keV | 32,008(23) keV | 96(3) µs | | | 2$^+$ | |
| $^{71}$As | 33 | 38 | 70,927112(5) | 65,28(15) uur | β$^+$ | $^{71}$Ge | 5/2$^−$ | |
| $^{72}$As | 33 | 39 | 71,926752(5) | 26,0(1) uur | β$^+$ | $^{72}$Ge | 2$^−$ | |
| $^{73}$As | 33 | 40 | 72,923825(4) | 80,30(6) dagen | EV | $^{73}$Ge | 3/2$^−$ | |
| $^{74}$As | 33 | 41 | 73,9239287(25) | 17,77(2) dagen | β$^+$ (66%) | $^{74}$Ge | 2$^−$ | |
| $^{74}$As | 33 | 41 | 73,9239287(25) | 17,77(2) dagen | β$^−$ (34%) | $^{74}$Se | 2$^−$ | |
| $^{75}$As | 33 | 42 | 74,9215965(20) | stabiel | stabiel | stabiel | 3/2$^−$ | 1,0000 |
| $^{75m}$As | 303,9241(7) keV | 303,9241(7) keV | 303,9241(7) keV | 17,62(23) ms | | | 9/2$^+$ | |
| $^{76}$As | 33 | 43 | 75,922394(2) | 1,0942(7) dagen | β$^−$ (99,98%) | $^{76}$Se | 2$^−$ | |
| $^{76}$As | 33 | 43 | 75,922394(2) | 1,0942(7) dagen | EV (0,02%) | $^{76}$Ge | 2$^−$ | |
| $^{76m}$As | 44,425(1) keV | 44,425(1) keV | 44,425(1) keV | 1,84(6) µs | | | 1$^+$ | |
| $^{77}$As | 33 | 44 | 76,9206473(25) | 38,83(5) uur | β$^−$ | $^{77m}$Se | 3/2$^−$ | |
| $^{77m}$As | 475,443(16) keV | 475,443(16) keV | 475,443(16) keV | 114,0(25) µs | | | 9/2$^+$ | |
| $^{78}$As | 33 | 45 | 77,921827(11) | 90,7(2) min | β$^−$ | $^{78}$Se | 2$^−$ | |
| $^{79}$As | 33 | 46 | 78,920948(6) | 9,01(15) min | β$^−$ | $^{79m}$Se | 3/2$^−$ | |
| $^{79m}$As | 772,81(6) keV | 772,81(6) keV | 772,81(6) keV | 1,21(1) µs | | | 9/2$^+$ | |
| $^{80}$As | 33 | 47 | 79,922534(25) | 15,2(2) s | β$^−$ | $^{80}$Se | 1$^+$ | |
| $^{81}$As | 33 | 48 | 80,922132(6) | 33,3(8) s | β$^−$ | $^{81m}$Se | 3/2$^−$ | |
| $^{82}$As | 33 | 49 | 81,92450(21) | 19,1(5) s | β$^−$ | $^{82}$Se | (1$^+$) | |
| $^{82m}$As | 250(200) keV | 250(200) keV | 250(200) keV | 13,6(4) s | β$^−$ | $^{82}$Se | (5$^−$) | |
| $^{83}$As | 33 | 50 | 82,92498(24) | 13,4(3) s | β$^−$ | $^{83m}$Se | 3/2$^−$ | |
| $^{84}$As | 33 | 51 | 83,92906(32) | 4,02(3) s | β$^−$ (99,721%) | $^{84}$Se | 3$^+$ | |
| $^{84}$As | 33 | 51 | 83,92906(32) | 4,02(3) s | β$^−$, n (0,029%) | $^{83}$Se | 3$^+$ | |
| $^{84m}$As | 0(100) keV | 0(100) keV | 0(100) keV | 650(150) ms | | | | |
| $^{85}$As | 33 | 52 | 84,93202(21) | 2,021(10) s | β$^−$, n (59,4%) | $^{84}$Se | (3/2$^−$) | |
| $^{85}$As | 33 | 52 | 84,93202(21) | 2,021(10) s | β$^−$ (40,6%) | $^{85}$Se | (3/2$^−$) | |
| $^{86}$As | 33 | 53 | 85,93650(32) | 0,945(8) s | β$^−$ (67%) | $^{86}$Se | | |
| $^{86}$As | 33 | 53 | 85,93650(32) | 0,945(8) s | β$^−$, n (33%) | $^{85}$Se | | |
| $^{87}$As | 33 | 54 | 86,93990(32) | 0,56(8) s | β$^−$ (84,6%) | $^{87}$Se | 3/2$^−$ | |
| $^{87}$As | 33 | 54 | 86,93990(32) | 0,56(8) s | β$^−$, n (15,4%) | $^{86}$Se | 3/2$^−$ | |
| $^{88}$As | 33 | 55 | 87,94494(54) | 300 ms | β$^−$ | $^{88}$Se | | |
| $^{88}$As | 33 | 55 | 87,94494(54) | 300 ms | β$^−$, n | $^{87}$Se | | |
| $^{89}$As | 33 | 56 | 88,94939(54) | 200 ms | β$^−$ | $^{89}$Se | 3/2$^−$ | |
| $^{90}$As | 33 | 57 | 89,95550(86) | 80 ms | | | | |
| $^{91}$As | 33 | 58 | 90,96043(97) | 50 ms | | | 3/2$^−$ | |
| $^{92}$As | 33 | 59 | 91,96680(97) | 30 ms | | | | |

## Overzicht van isotopen per element

* (en) R.B. Firestone, S.Y. Frank Chu & C.M. Baglin (1999) - Table of Isotopes (online versie van de cd-rom)
* (en) G. Audi, A.H. Wapstra, C. Thibault, J. Blachot & O. Bersillon (2003) - The NUBASE evaluation of nuclear and decay properties, Nuclear Physics A, 729, pp. 3-128
* (en) J.R. de Laeter, J.K. Böhlke, P. De Bièvre, H. Hidaka, H.S. Peiser, K.J.R. Rosman & P.D.P. Taylor (2003) - Atomic weights of the elements. Review 2000 (IUPAC Technical Report), Pure and Applied Chemistry, 75 (6), pp. 683–800
* (en) M.E. Wieser (2006) - Atomic weights of the elements 2005 (IUPAC Technical Report), Pure and Applied Chemistry, 78 (11), pp. 2051–2066
* (en) David R. Lide (2004) - CRC Handbook of Chemistry and Physics (85th ed.), hoofdstuk 11, CRC Press - ISBN 978-0849304859
$^{60}$As · $^{61}$As · $^{62}$As · $^{63}$As · $^{64}$As · $^{65}$As · $^{66}$As · $^{66m1}$As · $^{66m2}$As · $^{67}$As · $^{68}$As · $^{68m}$As · $^{69}$As · $^{70}$As · $^{70m}$As · $^{71}$As · $^{72}$As · $^{73}$As · $^{74}$As · $^{75}$As · $^{75m}$As · $^{76}$As · $^{76m}$As · $^{77}$As · $^{77m}$As · $^{78}$As · $^{79}$As · $^{79m}$As · $^{80}$As · $^{81}$As · $^{82}$As · $^{82m}$As · $^{83}$As · $^{84}$As · $^{84m}$As · $^{85}$As · $^{86}$As · $^{87}$As · $^{88}$As · $^{89}$As · $^{90}$As · $^{91}$As · $^{92}$As