Isotopes of bromine
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Standard atomic weight Ar°(Br) | ||||||||||||||||||||||||||||||||||||||||||||||
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Bromine (35Br) has two stable isotopes, 79Br and 81Br, and 30 known radioisotopes, the most stable of which is 77Br, with a half-life of 57.036 hours. Bromine and chlorine are the only halogens with more than one stable isotope.
List of isotopes
nuclide symbol |
Z(p) | N(n) | isotopic mass (u) |
half-life | decay mode(s)[4][n 1] |
daughter isotope(s)[n 2] |
nuclear spin and parity |
representative isotopic composition (mole fraction) |
range of natural variation (mole fraction) |
---|---|---|---|---|---|---|---|---|---|
excitation energy | |||||||||
66Br | 35 | 31 | p | 65Se | |||||
67Br | 35 | 32 | 66.96479(54)# | p | 66Se | 1/2−# | |||
68Br | 35 | 33 | 67.95852(38)# | <1.2 µs | p | 67Se | 3+# | ||
69Br | 35 | 34 | 68.95011(11)# | <24 ns | p | 68Se | 1/2−# | ||
70Br | 35 | 35 | 69.94479(33)# | 79.1(8) ms | β+ | 70Se | 0+# | ||
70mBr | 2292.2(8) keV | 2.2(2) s | β+ | 70Se | (9+) | ||||
IT | 70Br | ||||||||
71Br | 35 | 36 | 70.93874(61) | 21.4(6) s | β+ | 71Se | (5/2)− | ||
72Br | 35 | 37 | 71.93664(6) | 78.6(24) s | β+ | 72Se | 1+ | ||
72mBr | 100.92(3) keV | 10.6(3) s | IT (>99.9%) | 72Br | 1− | ||||
β+ (<0.1%) | 72Se | ||||||||
73Br | 35 | 38 | 72.93169(5) | 3.4(2) min | β+ | 73Se | 1/2− | ||
74Br | 35 | 39 | 73.929891(16) | 25.4(3) min | β+ | 74Se | (0−) | ||
74mBr | 13.58(21) keV | 46(2) min | β+ | 74Se | 4(+#) | ||||
75Br | 35 | 40 | 74.925776(15) | 96.7(13) min | β+ | 75Se | 3/2− | ||
76Br | 35 | 41 | 75.924541(10) | 16.2(2) h | β+ | 76Se | 1− | ||
76mBr | 102.58(3) keV | 1.31(2) s | IT (99.4%) | 76Br | (4)+ | ||||
β+ (0.6%) | 76Se | ||||||||
77Br | 35 | 42 | 76.921379(3) | 57.036(6) h | β+ | 77Se | 3/2− | ||
77mBr | 105.86(8) keV | 4.28(10) min | IT | 77Br | 9/2+ | ||||
78Br | 35 | 43 | 77.921146(4) | 6.46(4) min | β+ (99.99%) | 78Se | 1+ | ||
β− (0.01%) | 78Kr | ||||||||
78mBr | 180.82(13) keV | 119.2(10) µs | (4+) | ||||||
79Br | 35 | 44 | 78.9183371(22) | Stable | 3/2− | 0.5069(7) | |||
79mBr | 207.61(9) keV | 4.86(4) s | IT | 79Br | (9/2+) | ||||
80Br | 35 | 45 | 79.9185293(22) | 17.68(2) min | β− (91.7%) | 80Kr | 1+ | ||
β+ (8.3%) | 80Se | ||||||||
80mBr | 85.843(4) keV | 4.4205(8) h | IT | 80Br | 5− | ||||
81Br | 35 | 46 | 80.9162906(21) | Stable | 3/2− | 0.4931(7) | |||
81mBr | 536.20(9) keV | 34.6(28) µs | 9/2+ | ||||||
82Br | 35 | 47 | 81.9168041(21) | 35.282(7) h | β− | 82Kr | 5− | ||
82mBr | 45.9492(10) keV | 6.13(5) min | IT | 82Br | 2− | ||||
β− | 82Kr | ||||||||
83Br | 35 | 48 | 82.915180(5) | 2.40(2) h | β− | 83Kr | 3/2− | ||
83mBr | 3068.8(6) keV | 700(100) ns | (19/2−) | ||||||
84Br | 35 | 49 | 83.916479(16) | 31.80(8) min | β− | 84Kr | 2− | ||
84m1Br | 320(10) keV | 6.0(2) min | β− | 84Kr | 6− | ||||
84m2Br | 408.2(4) keV | <140 ns | 1+ | ||||||
85Br | 35 | 50 | 84.915608(21) | 2.90(6) min | β− | 85Kr | 3/2− | ||
86Br | 35 | 51 | 85.918798(12) | 55.1(4) s | β− | 86Kr | (2−) | ||
87Br | 35 | 52 | 86.920711(19) | 55.65(13) s | β− (97.48%) | 87Kr | 3/2− | ||
β−, n (2.52%) | 86Kr | ||||||||
88Br | 35 | 53 | 87.92407(4) | 16.29(6) s | β− (93.42%) | 88Kr | (2−) | ||
β−, n (6.48%) | 87Kr | ||||||||
88mBr | 272.7(3) keV | 5.4(7) µs | |||||||
89Br | 35 | 54 | 88.92639(6) | 4.40(3) s | β− (86.2%) | 89Kr | (3/2−,5/2−) | ||
β−, n (13.8%) | 88Kr | ||||||||
90Br | 35 | 55 | 89.93063(8) | 1.91(1) s | β− (74.8%) | 90Kr | |||
β−, n (25.2%) | 89Kr | ||||||||
91Br | 35 | 56 | 90.93397(8) | 541(5) ms | β− (80%) | 91Kr | 3/2−# | ||
β−, n (20%) | 90Kr | ||||||||
92Br | 35 | 57 | 91.93926(5) | 0.343(15) s | β− (66.9%) | 92Kr | (2−) | ||
β−, n (33.1%) | 91Kr | ||||||||
93Br | 35 | 58 | 92.94305(32)# | 102(10) ms | β− (89%) | 93Kr | 3/2−# | ||
β−, n (11%) | 92Kr | ||||||||
94Br | 35 | 59 | 93.94868(43)# | 70(20) ms | β− (70%) | 94Kr | |||
β−, n (30%) | 93Kr | ||||||||
95Br | 35 | 60 | 94.95287(54)# | 50# ms [>300 ns] | 3/2−# | ||||
96Br | 35 | 61 | 95.95853(75)# | 20# ms [>300 ns] | |||||
97Br | 35 | 62 | 96.96280(86)# | 10# ms [>300 ns] | 3/2−# |
- ^ Abbreviations:
IT: Isomeric transition - ^ Bold for stable isotopes
Notes
- Values marked # are not purely derived from experimental data, but at least partly from systematic trends. Spins with weak assignment arguments are enclosed in parentheses.
- Uncertainties are given in concise form in parentheses after the corresponding last digits. Uncertainty values denote one standard deviation, except isotopic composition and standard atomic mass from IUPAC, which use expanded uncertainties.
References
- ^ 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: Bromine". CIAAW. 2011.
- ^ 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.
- ^ "Universal Nuclide Chart". nucleonica.
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: Unknown parameter|registration=
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suggested) (help)
- Isotope masses from:
- G. Audi; A. H. Wapstra; C. Thibault; J. Blachot; O. Bersillon (2003). "The NUBASE evaluation of nuclear and decay properties" (PDF). Nuclear Physics A. 729 (1): 3–128. Bibcode:2003NuPhA.729....3A. CiteSeerX 10.1.1.692.8504. doi:10.1016/j.nuclphysa.2003.11.001. Archived from the original (PDF) on 2008-09-23.
{{cite journal}}
: Unknown parameter|deadurl=
ignored (|url-status=
suggested) (help)
- G. Audi; A. H. Wapstra; C. Thibault; J. Blachot; O. Bersillon (2003). "The NUBASE evaluation of nuclear and decay properties" (PDF). Nuclear Physics A. 729 (1): 3–128. Bibcode:2003NuPhA.729....3A. CiteSeerX 10.1.1.692.8504. doi:10.1016/j.nuclphysa.2003.11.001. Archived from the original (PDF) on 2008-09-23.
- Isotopic compositions and standard atomic masses from:
- 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): 683–800. doi:10.1351/pac200375060683.
- M. E. Wieser (2006). "Atomic weights of the elements 2005 (IUPAC Technical Report)". Pure and Applied Chemistry. 78 (11): 2051–2066. doi:10.1351/pac200678112051.
{{cite journal}}
: Unknown parameter|laysummary=
ignored (help)
- Half-life, spin, and isomer data selected from the following sources. See editing notes on this article's talk page.
- G. Audi; A. H. Wapstra; C. Thibault; J. Blachot; O. Bersillon (2003). "The NUBASE evaluation of nuclear and decay properties" (PDF). Nuclear Physics A. 729 (1): 3–128. Bibcode:2003NuPhA.729....3A. CiteSeerX 10.1.1.692.8504. doi:10.1016/j.nuclphysa.2003.11.001. Archived from the original (PDF) on 2008-09-23.
{{cite journal}}
: Unknown parameter|deadurl=
ignored (|url-status=
suggested) (help) - National Nuclear Data Center. "NuDat 2.1 database". Brookhaven National Laboratory. Retrieved September 2005.
{{cite web}}
: Check date values in:|accessdate=
(help) - N. E. Holden (2004). "Table of the Isotopes". In D. R. Lide (ed.). CRC Handbook of Chemistry and Physics (85th ed.). CRC Press. Section 11. ISBN 978-0-8493-0485-9.
{{cite book}}
: Unknown parameter|nopp=
ignored (|no-pp=
suggested) (help)
- G. Audi; A. H. Wapstra; C. Thibault; J. Blachot; O. Bersillon (2003). "The NUBASE evaluation of nuclear and decay properties" (PDF). Nuclear Physics A. 729 (1): 3–128. Bibcode:2003NuPhA.729....3A. CiteSeerX 10.1.1.692.8504. doi:10.1016/j.nuclphysa.2003.11.001. Archived from the original (PDF) on 2008-09-23.