Arsenic-75
Isotopes of arsenic
Nuclides with atomic number of 33 but with different mass numbers
Arsenic (33As) has 33 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.
More information Nuclide, Z ...
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] |
Natural abundance (mole fraction) | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Excitation energy[n 8] | Normal proportion[1] | Range of variation | |||||||||||||||||
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 | |||||||||||||||||
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- 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.
- # – Values marked # are not purely derived from experimental data, but at least partly from trends of neighboring nuclides (TNN).
- 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.
- 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.
- 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
- Isotopic compositions and standard atomic masses from:
- de Laeter, John Robert; Böhlke, John Karl; De Bièvre, Paul; Hidaka, Hiroshi; Peiser, H. Steffen; Rosman, Kevin J. R.; Taylor, Philip D. P. (2003). "Atomic weights of the elements. Review 2000 (IUPAC Technical Report)". Pure and Applied Chemistry. 75 (6): 683–800. doi:10.1351/pac200375060683.
- Wieser, Michael E. (2006). "Atomic weights of the elements 2005 (IUPAC Technical Report)". Pure and Applied Chemistry. 78 (11): 2051–2066. doi:10.1351/pac200678112051.
- "News & Notices: Standard Atomic Weights Revised". International Union of Pure and Applied Chemistry. 19 October 2005.
- 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.