Arsenic (33As) has 32 known isotopes and at least 10 isomers. Only one of these isotopes, 75As, is stable; as such, it is considered a monoisotopic element. The longest-lived radioisotope is 73As with a half-life of 80 days.
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| Standard atomic weight Ar°(As) | ||||||||||||||||||||||||||||||||||
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List of isotopes
edit
| Nuclide [n 1] |
Z | N | Isotopic mass (Da)[4] [n 2][n 3] |
Half-life[1] |
Decay mode[1] [n 4] |
Daughter isotope [n 5][n 6] |
Spin and parity[1] [n 7][n 8] |
Isotopic abundance | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Excitation energy[n 8] | |||||||||||||||||||
| 64As | 33 | 31 | 63.95756(22)# | 69.0(14) ms | β+ | 64Ge | 0+# | ||||||||||||
| β+, p? | 63Ga | ||||||||||||||||||
| 65As | 33 | 32 | 64.949611(91) | 130.3(6) ms | β+ | 65Ge | 3/2−# | ||||||||||||
| β+, p? | 64Ga | ||||||||||||||||||
| 66As | 33 | 33 | 65.9441488(61) | 95.77(23) ms | β+ | 66Ge | 0+ | ||||||||||||
| 66m1As | 1356.63(17) keV | 1.14(4) μs | IT | 66As | 5+ | ||||||||||||||
| 66m2As | 3023.(3) keV | 7.98(26) μs | IT | 66As | 9+ | ||||||||||||||
| 67As | 33 | 34 | 66.93925111(48) | 42.5(12) s | β+ | 67Ge | (5/2−) | ||||||||||||
| 68As | 33 | 35 | 67.9367741(20) | 151.6(8) s | β+ | 68Ge | 3+ | ||||||||||||
| 68mAs | 425.1(2) keV | 111(20) ns | IT | 68As | 1+ | ||||||||||||||
| 69As | 33 | 36 | 68.932246(34) | 15.2(2) min | β+ | 69Ge | 5/2− | ||||||||||||
| 70As | 33 | 37 | 69.9309346(15) | 52.6(3) min | β+ | 70Ge | 4+ | ||||||||||||
| 70mAs | 32.046(23) keV | 96(3) μs | IT | 70As | 2+ | ||||||||||||||
| 71As | 33 | 38 | 70.9271136(45) | 65.30(7) h | β+ | 71Ge | 5/2− | ||||||||||||
| 72As | 33 | 39 | 71.9267523(44) | 26.0(1) h | β+ | 72Ge | 2− | ||||||||||||
| 73As | 33 | 40 | 72.9238291(41) | 80.30(6) d | EC | 73Ge | 3/2− | ||||||||||||
| 73mAs | 427.902(21) keV | 5.7(2) μs | IT | 73As | 9/2+ | ||||||||||||||
| 74As | 33 | 41 | 73.9239286(18) | 17.77(2) d | β+ (66%) | 74Ge | 2− | ||||||||||||
| β− (34%) | 74Se | ||||||||||||||||||
| 75As | 33 | 42 | 74.92159456(95) | Stable | 3/2− | 1.0000 | |||||||||||||
| 75mAs | 303.9243(8) keV | 17.62(23) ms | IT | 75As | 9/2+ | ||||||||||||||
| 76As | 33 | 43 | 75.92239201(95) | 1.0933(38) d | β− | 76Se | 2− | ||||||||||||
| 76mAs | 44.425(1) keV | 1.84(6) μs | IT | 76As | (1)+ | ||||||||||||||
| 77As | 33 | 44 | 76.9206476(18) | 38.79(5) h | β− | 77Se | 3/2− | ||||||||||||
| 77mAs | 475.48(4) keV | 114.0(25) μs | IT | 77As | 9/2+ | ||||||||||||||
| 78As | 33 | 45 | 77.921828(10) | 90.7(2) min | β− | 78Se | 2− | ||||||||||||
| 79As | 33 | 46 | 78.9209484(57) | 9.01(15) min | β− | 79Se | 3/2− | ||||||||||||
| 79mAs | 772.81(6) keV | 1.21(1) μs | IT | 79As | (9/2)+ | ||||||||||||||
| 80As | 33 | 47 | 79.9224744(36) | 15.2(2) s | β− | 80Se | 1+ | ||||||||||||
| 81As | 33 | 48 | 80.9221323(28) | 33.3(8) s | β− | 81Se | 3/2− | ||||||||||||
| 82As | 33 | 49 | 81.9247387(40) | 19.1(5) s | β− | 82Se | (2−) | ||||||||||||
| 82mAs | 131.6(5) keV | 13.6(4) s | β− | 82Se | (5-) | ||||||||||||||
| 83As | 33 | 50 | 82.9252069(30) | 13.4(4) s | β− | 83Se | 5/2−# | ||||||||||||
| 84As | 33 | 51 | 83.9293033(34) | 3.16(58) s | β− (99.72%) | 84Se | (2−) | ||||||||||||
| β−, n (.28%) | 83Se | ||||||||||||||||||
| 85As | 33 | 52 | 84.9321637(33) | 2.022(7) s | β−, n (62.6%) | 84Se | (5/2−) | ||||||||||||
| β− (37.4%) | 85Se | ||||||||||||||||||
| 86As | 33 | 53 | 85.9367015(37) | 945(8) ms | β− (64.5%) | 86Se | (1−,2−) | ||||||||||||
| β−, n (35.5%) | 85Se | ||||||||||||||||||
| β−, 2n? | 84Se | ||||||||||||||||||
| 87As | 33 | 54 | 86.9402917(32) | 492(25) ms | β− (84.6%) | 87Se | (5/2−,3/2−) | ||||||||||||
| β−, n (15.4%) | 86Se | ||||||||||||||||||
| β−, 2n? | 85Se | ||||||||||||||||||
| 88As | 33 | 55 | 87.94584(22)# | 270(150) ms | β− | 88Se | |||||||||||||
| β−, n? | 87Se | ||||||||||||||||||
| 89As | 33 | 56 | 88.95005(32)# | 220# ms [>150 ns] | β−? | 89Se | 5/2−# | ||||||||||||
| β−, n? | 88Se | ||||||||||||||||||
| β−, 2n? | 87Se | ||||||||||||||||||
| 90As | 33 | 57 | 89.95600(43)# | 70# ms [>300 ns] | β−? | 90Se | |||||||||||||
| β−, n? | 89Se | ||||||||||||||||||
| β−, 2n? | 88Se | ||||||||||||||||||
| 90mAs | 124.5(5) keV | 220(100) ns | IT | 90As | |||||||||||||||
| 91As | 33 | 58 | 90.96082(43)# | 100# ms [>300 ns] | β−? | 91Se | 5/2−# | ||||||||||||
| β−, n? | 90Se | ||||||||||||||||||
| β−, 2n? | 89Se | ||||||||||||||||||
| 92As | 33 | 59 | 91.96739(54)# | 45# ms [>300 ns] | β−? | 92Se | |||||||||||||
| β−, n? | 91Se | ||||||||||||||||||
| β−, 2n? | 90Se | ||||||||||||||||||
| 93As[5] | 33 | 60 | |||||||||||||||||
| 94As[5] | 33 | 61 | |||||||||||||||||
| 95As[5] | 33 | 62 | |||||||||||||||||
| This table header & footer: | |||||||||||||||||||
- ^ mAs – Excited nuclear isomer.
- ^ ( ) – Uncertainty (1σ) is given in concise form in parentheses after the corresponding last digits.
- ^ # – Atomic mass marked #: value and uncertainty derived not from purely experimental data, but at least partly from trends from the Mass Surface (TMS).
- ^
Modes of decay:
EC: Electron capture
n: Neutron emission p: Proton emission - ^ Bold italics symbol as daughter – Daughter product is nearly stable.
- ^ Bold symbol as daughter – Daughter product is stable.
- ^ ( ) spin value – Indicates spin with weak assignment arguments.
- ^ a b # – Values marked # are not purely derived from experimental data, but at least partly from trends of neighboring nuclides (TNN).
References
edit- ^ a b c d Kondev, F. G.; Wang, M.; Huang, W. J.; Naimi, S.; Audi, G. (2021). "The NUBASE2020 evaluation of nuclear properties" (PDF). Chinese Physics C. 45 (3): 030001. doi:10.1088/1674-1137/abddae.
- ^ "Standard Atomic Weights: Arsenic". CIAAW. 2013.
- ^ Prohaska, Thomas; Irrgeher, Johanna; Benefield, Jacqueline; Böhlke, John K.; Chesson, Lesley A.; Coplen, Tyler B.; Ding, Tiping; Dunn, Philip J. H.; Gröning, Manfred; Holden, Norman E.; Meijer, Harro A. J. (2022-05-04). "Standard atomic weights of the elements 2021 (IUPAC Technical Report)". Pure and Applied Chemistry. doi:10.1515/pac-2019-0603. ISSN 1365-3075.
- ^ Wang, Meng; Huang, W.J.; Kondev, F.G.; Audi, G.; Naimi, S. (2021). "The AME 2020 atomic mass evaluation (II). Tables, graphs and references*". Chinese Physics C. 45 (3): 030003. doi:10.1088/1674-1137/abddaf.
- ^ a b c Shimizu, Y.; Kubo, T.; Sumikama, T.; Fukuda, N.; Takeda, H.; Suzuki, H.; Ahn, D. S.; Inabe, N.; Kusaka, K.; Ohtake, M.; Yanagisawa, Y.; Yoshida, K.; Ichikawa, Y.; Isobe, T.; Otsu, H.; Sato, H.; Sonoda, T.; Murai, D.; Iwasa, N.; Imai, N.; Hirayama, Y.; Jeong, S. C.; Kimura, S.; Miyatake, H.; Mukai, M.; Kim, D. G.; Kim, E.; Yagi, A. (8 April 2024). "Production of new neutron-rich isotopes near the N = 60 isotones Ge 92 and As 93 by in-flight fission of a 345 MeV/nucleon U 238 beam". Physical Review C. 109 (4). doi:10.1103/PhysRevC.109.044313.
- Isotope masses from:
- Audi, Georges; Bersillon, Olivier; Blachot, Jean; Wapstra, Aaldert Hendrik (2003), "The NUBASE evaluation of nuclear and decay properties", Nuclear Physics A, 729: 3–128, Bibcode:2003NuPhA.729....3A, doi:10.1016/j.nuclphysa.2003.11.001
- Half-life, spin, and isomer data selected from the following sources.
- Audi, Georges; Bersillon, Olivier; Blachot, Jean; Wapstra, Aaldert Hendrik (2003), "The NUBASE evaluation of nuclear and decay properties", Nuclear Physics A, 729: 3–128, Bibcode:2003NuPhA.729....3A, doi:10.1016/j.nuclphysa.2003.11.001
- National Nuclear Data Center. "NuDat 2.x database". Brookhaven National Laboratory.
- Holden, Norman E. (2004). "11. Table of the Isotopes". In Lide, David R. (ed.). CRC Handbook of Chemistry and Physics (85th ed.). Boca Raton, Florida: CRC Press. ISBN 978-0-8493-0485-9.
- A.Shore, A. Fritsch, M. Heim, A. Schuh, M. Thoennessen. Discovery of the Arsenic Isotopes. arXiv:0902.4361.