Bromine Bromine is a chemical element with the symbol Br and atomic number 35. It is the third-lightest element in group 17 of the periodic table ( halogens) and is a volatile red-brown liquid at room temperature that evaporates readily to form a simi ...

(₃₅Br) has two stable isotopes, ⁷⁹Br and ⁸¹Br, and 32 known radioisotopes, the most stable of which is ⁷⁷Br, with a

half-life Half-life (symbol ) is the time required for a quantity (of substance) to reduce to half of its initial value. The term is commonly used in nuclear physics to describe how quickly unstable atoms undergo radioactive decay or how long stable ...

of 57.036 hours.

List of isotopes

, - , ⁶⁸Br , style="text-align:right" , 35 , style="text-align:right" , 33 , 67.95836(28)# , ~50 ns , p , ⁶⁷Se , 3+# , , , - , ⁶⁹Br , style="text-align:right" , 35 , style="text-align:right" , 34 , 68.95011(11)# , <24 ns , p , ⁶⁸Se , 1/2−# , , , - , ⁷⁰Br , style="text-align:right" , 35 , style="text-align:right" , 35 , 69.94479(33)# , 79.1(8) ms , β⁺ , ⁷⁰Se , 0+# , , , - , rowspan=2 style="text-indent:1em" , ^70mBr , rowspan=2 colspan="3" style="text-indent:2em" , 2292.2(8) keV , rowspan=2, 2.2(2) s , β⁺ , ⁷⁰Se , rowspan=2, (9+) , rowspan=2, , rowspan=2, , - , IT , ⁷⁰Br , - , ⁷¹Br , style="text-align:right" , 35 , style="text-align:right" , 36 , 70.93874(61) , 21.4(6) s , β⁺ , ⁷¹Se , (5/2)− , , , - , ⁷²Br , style="text-align:right" , 35 , style="text-align:right" , 37 , 71.93664(6) , 78.6(24) s , β⁺ , ⁷²Se , 1+ , , , - , rowspan=2 style="text-indent:1em" , ^72mBr , rowspan=2 colspan="3" style="text-indent:2em" , 100.92(3) keV , rowspan=2, 10.6(3) s , IT (>99.9%) , ⁷²Br , rowspan=2, 1− , rowspan=2, , rowspan=2, , - , β⁺ (<0.1%) , ⁷²Se , - , ⁷³Br , style="text-align:right" , 35 , style="text-align:right" , 38 , 72.93169(5) , 3.4(2) min , β⁺ , ⁷³Se , 1/2− , , , - , ⁷⁴Br , style="text-align:right" , 35 , style="text-align:right" , 39 , 73.929891(16) , 25.4(3) min , β⁺ , ⁷⁴Se , (0−) , , , - , style="text-indent:1em" , ^74mBr , colspan="3" style="text-indent:2em" , 13.58(21) keV , 46(2) min , β⁺ , ⁷⁴Se , 4(+#) , , , - , ⁷⁵Br , style="text-align:right" , 35 , style="text-align:right" , 40 , 74.925776(15) , 96.7(13) min , β⁺ , ⁷⁵Se , 3/2− , , , - , ⁷⁶Br , style="text-align:right" , 35 , style="text-align:right" , 41 , 75.924541(10) , 16.2(2) h , β⁺ , ⁷⁶Se , 1− , , , - , rowspan=2 style="text-indent:1em" , ^76mBr , rowspan=2 colspan="3" style="text-indent:2em" , 102.58(3) keV , rowspan=2, 1.31(2) s , IT (99.4%) , ⁷⁶Br , rowspan=2, (4)+ , rowspan=2, , rowspan=2, , - , β⁺ (0.6%) , ⁷⁶Se , - , ⁷⁷Br , style="text-align:right" , 35 , style="text-align:right" , 42 , 76.921379(3) , 57.036(6) h , β⁺ , ⁷⁷Se , 3/2− , , , - , style="text-indent:1em" , ^77mBr , colspan="3" style="text-indent:2em" , 105.86(8) keV , 4.28(10) min , IT , ⁷⁷Br , 9/2+ , , , - , rowspan=2, ⁷⁸Br , rowspan=2 style="text-align:right" , 35 , rowspan=2 style="text-align:right" , 43 , rowspan=2, 77.921146(4) , rowspan=2, 6.46(4) min , β⁺ (99.99%) , ⁷⁸Se , rowspan=2, 1+ , rowspan=2, , rowspan=2, , - , β⁻ (0.01%) , ''⁷⁸Kr'' , - , style="text-indent:1em" , ^78mBr , colspan="3" style="text-indent:2em" , 180.82(13) keV , 119.2(10) µs , , , (4+) , , , - , ⁷⁹Br , style="text-align:right" , 35 , style="text-align:right" , 44 , 78.9183371(22) , colspan=3 align=center, Stable , 3/2− , 0.5069(7) , , - , style="text-indent:1em" , ^79mBr , colspan="3" style="text-indent:2em" , 207.61(9) keV , 4.86(4) s , IT , ⁷⁹Br , (9/2+) , , , - , rowspan=2, ⁸⁰Br , rowspan=2 style="text-align:right" , 35 , rowspan=2 style="text-align:right" , 45 , rowspan=2, 79.9185293(22) , rowspan=2, 17.68(2) min , β⁻ (91.7%) , ⁸⁰Kr , rowspan=2, 1+ , rowspan=2, , rowspan=2, , - , β⁺ (8.3%) , ⁸⁰Se , - , style="text-indent:1em" , ^80mBr , colspan="3" style="text-indent:2em" , 85.843(4) keV , 4.4205(8) h , IT , ⁸⁰Br , 5− , , , - , ⁸¹Br , style="text-align:right" , 35 , style="text-align:right" , 46 , 80.9162906(21) , colspan=3 align=center, Stable , 3/2− , 0.4931(7) , , - , style="text-indent:1em" , ^81mBr , colspan="3" style="text-indent:2em" , 536.20(9) keV , 34.6(28) µs , , , 9/2+ , , , - , ⁸²Br , style="text-align:right" , 35 , style="text-align:right" , 47 , 81.9168041(21) , 35.282(7) h , β⁻ , ⁸²Kr , 5− , , , - , rowspan=2 style="text-indent:1em" , ^82mBr , rowspan=2 colspan="3" style="text-indent:2em" , 45.9492(10) keV , rowspan=2, 6.13(5) min , IT , ⁸²Br , rowspan=2, 2− , rowspan=2, , rowspan=2, , - , β⁻ , ⁸²Kr , - , ⁸³Br , style="text-align:right" , 35 , style="text-align:right" , 48 , 82.915180(5) , 2.40(2) h , β⁻ , ⁸³Kr , 3/2− , , , - , style="text-indent:1em" , ^83mBr , colspan="3" style="text-indent:2em" , 3068.8(6) keV , 700(100) ns , , , (19/2−) , , , - , ⁸⁴Br , style="text-align:right" , 35 , style="text-align:right" , 49 , 83.916479(16) , 31.80(8) min , β⁻ , ⁸⁴Kr , 2− , , , - , style="text-indent:1em" , ^84m1Br , colspan="3" style="text-indent:2em" , 320(10) keV , 6.0(2) min , β⁻ , ⁸⁴Kr , 6− , , , - , style="text-indent:1em" , ^84m2Br , colspan="3" style="text-indent:2em" , 408.2(4) keV , <140 ns , , , 1+ , , , - , ⁸⁵Br , style="text-align:right" , 35 , style="text-align:right" , 50 , 84.915608(21) , 2.90(6) min , β⁻ , ⁸⁵Kr , 3/2− , , , - , ⁸⁶Br , style="text-align:right" , 35 , style="text-align:right" , 51 , 85.918798(12) , 55.1(4) s , β⁻ , ⁸⁶Kr , (2−) , , , - , rowspan=2, ⁸⁷Br , rowspan=2 style="text-align:right" , 35 , rowspan=2 style="text-align:right" , 52 , rowspan=2, 86.920711(19) , rowspan=2, 55.65(13) s , β⁻ (97.48%) , ⁸⁷Kr , rowspan=2, 3/2− , rowspan=2, , rowspan=2, , - , β⁻, n (2.52%) , ⁸⁶Kr , - , rowspan=2, ⁸⁸Br , rowspan=2 style="text-align:right" , 35 , rowspan=2 style="text-align:right" , 53 , rowspan=2, 87.92407(4) , rowspan=2, 16.29(6) s , β⁻ (93.42%) , ⁸⁸Kr , rowspan=2, (2−) , rowspan=2, , rowspan=2, , - , β⁻, n (6.48%) , ⁸⁷Kr , - , style="text-indent:1em" , ^88mBr , colspan="3" style="text-indent:2em" , 272.7(3) keV , 5.4(7) µs , , , , , , - , rowspan=2, ⁸⁹Br , rowspan=2 style="text-align:right" , 35 , rowspan=2 style="text-align:right" , 54 , rowspan=2, 88.92639(6) , rowspan=2, 4.40(3) s , β⁻ (86.2%) , ⁸⁹Kr , rowspan=2, (3/2−,5/2−) , rowspan=2, , rowspan=2, , - , β⁻, n (13.8%) , ⁸⁸Kr , - , rowspan=2, ⁹⁰Br , rowspan=2 style="text-align:right" , 35 , rowspan=2 style="text-align:right" , 55 , rowspan=2, 89.93063(8) , rowspan=2, 1.91(1) s , β⁻ (74.8%) , ⁹⁰Kr , rowspan=2, , rowspan=2, , rowspan=2, , - , β⁻, n (25.2%) , ⁸⁹Kr , - , rowspan=2, ⁹¹Br , rowspan=2 style="text-align:right" , 35 , rowspan=2 style="text-align:right" , 56 , rowspan=2, 90.93397(8) , rowspan=2, 541(5) ms , β⁻ (80%) , ⁹¹Kr , rowspan=2, 3/2−# , rowspan=2, , rowspan=2, , - , β⁻, n (20%) , ⁹⁰Kr , - , rowspan=2, ⁹²Br , rowspan=2 style="text-align:right" , 35 , rowspan=2 style="text-align:right" , 57 , rowspan=2, 91.93926(5) , rowspan=2, 0.343(15) s , β⁻ (66.9%) , ⁹²Kr , rowspan=2, (2−) , rowspan=2, , rowspan=2, , - , β⁻, n (33.1%) , ⁹¹Kr , - , rowspan=2, ⁹³Br , rowspan=2 style="text-align:right" , 35 , rowspan=2 style="text-align:right" , 58 , rowspan=2, 92.94305(32)# , rowspan=2, 102(10) ms , β⁻ (89%) , ⁹³Kr , rowspan=2, 3/2−# , rowspan=2, , rowspan=2, , - , β⁻, n (11%) , ⁹²Kr , - , rowspan=2, ⁹⁴Br , rowspan=2 style="text-align:right" , 35 , rowspan=2 style="text-align:right" , 59 , rowspan=2, 93.94868(43)# , rowspan=2, 70(20) ms , β⁻ (70%) , ⁹⁴Kr , rowspan=2, , rowspan=2, , rowspan=2, , - , β⁻, n (30%) , ⁹³Kr , - , ⁹⁵Br , style="text-align:right" , 35 , style="text-align:right" , 60 , 94.95287(54)# , 50# ms 300 ns, , , 3/2−# , , , - , ⁹⁶Br , style="text-align:right" , 35 , style="text-align:right" , 61 , 95.95853(75)# , 20# ms 300 ns, , , , , , - , ⁹⁷Br , style="text-align:right" , 35 , style="text-align:right" , 62 , 96.96280(86)# , 10# ms 300 ns, , , 3/2−# , , , - , ⁹⁸Br , style="text-align:right" , 35 , style="text-align:right" , 63 , , , , , , , , - , ¹⁰¹Br , style="text-align:right" , 35 , style="text-align:right" , 66 , , , , , , ,

References

* Isotope masses from: ** * Isotopic compositions and standard atomic masses from: ** ** * Half-life, spin, and isomer data selected from the following sources. ** ** ** {{Authority control Bromine