Isotopes of bromine
List of isotopes
Abbreviations: IT: Isomeric transition Bold for stable isotopes

Isotopes of bromine

Section Title: List of isotopes
Table Section Text: Abbreviations: IT: Isomeric transition Bold for stable isotopes

nuclide symbol	Z(p)	N(n)	isotopic mass (u)	half-life	decay mode(s)	daughter isotope(s)	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−#

Sentence(s)

Bromine has two stable isotopes, ⁷⁹Br and ⁸¹Br, while ⁷⁷Br has a half-life of 57.036 hours.

final_sentence: Bromine has two stable isotopes, ⁷⁹Br and ⁸¹Br, while ⁷⁷Br has a half-life of 57.036 hours.