Isotopes of Arsenic

List of known isotopes of the element Arsenic.

Isotope	t½	%	Spin/parity	Radius	Isotopic mass	Discovery
⁶³As	43 ns	syn.	3/2-	—	6.296·10⁷ ±215 keV/c²	—
⁶⁴As	69 ±14 ms	syn.	—	—	6.395·10⁷ ±218 keV/c²	1995
⁶⁵As	128 ±16 ms	syn.	—	—	6.494·10⁷ ±91 keV/c²	1991
⁶⁶As	95.77 ±23 ms	syn.	⁰⁺	—	6.594·10⁷ ±6.1 keV/c²	1978
⁶⁷As	42.5 ±12 s	syn.	(5/2-)	—	6.693·10⁷ ±0.475 keV/c²	1980
⁶⁸As	151.6 ±8 s	syn.	3+	—	6.793·10⁷ ±1.981 keV/c²	1971
⁶⁹As	15.2 ±2 m	syn.	5/2-	—	6.893·10⁷ ±34.35 keV/c²	1955
⁷⁰As	52.6 ±3 m	syn.	4+	—	6.993·10⁷ ±1.5 keV/c²	1950
⁷¹As	65.3 ±7 h	syn.	5/2-	—	7.092·10⁷ ±4.469 keV/c²	1939
⁷²As	26 ±1 h	syn.	2-	—	7.192·10⁷ ±4.383 keV/c²	1939
⁷³As	80.3 ±6 d	syn.	3/2-	—	7.292·10⁷ ±4.136 keV/c²	1948
⁷⁴As	17.77 ±2 d	syn.	2-	—	7.392·10⁷ ±1.817 keV/c²	1938
⁷⁵As	stab.	100 %	3/2-	4.096 ±0.002 fm	7.492·10⁷ ±0.948 keV/c²	1920
⁷⁶As	26.24 ±9 h	syn.	2-	—	7.592·10⁷ ±0.951 keV/c²	1934
⁷⁷As	38.79 ±5 h	syn.	3/2-	—	7.692·10⁷ ±1.816 keV/c²	1951
⁷⁸As	90.7 ±2 m	syn.	2-	—	7.792·10⁷ ±10.49 keV/c²	1937
⁷⁹As	9.01 ±15 m	syn.	3/2-	—	7.892·10⁷ ±5.716 keV/c²	1950
⁸⁰As	15.2 ±2 s	syn.	1+	—	7.992·10⁷ ±3.578 keV/c²	1954
⁸¹As	33.3 ±8 s	syn.	3/2-	—	8.092·10⁷ ±2.838 keV/c²	1960
⁸²As	19.1 ±5 s	syn.	(2-)	—	8.192·10⁷ ±4.003 keV/c²	1968
⁸³As	13.4 ±4 s	syn.	(5/2-)	—	8.292·10⁷ ±3.004 keV/c²	1968
⁸⁴As	4.2 ±5 s	syn.	(3-)	—	8.392·10⁷ ±3.403 keV/c²	1968
⁸⁵As	2.021 ±12 s	syn.	(3/2-)	—	8.493·10⁷ ±3.304 keV/c²	1967
⁸⁶As	0.945 ±8 s	syn.	—	—	8.593·10⁷ ±3.703 keV/c²	1973
⁸⁷As	484 ±40 ms	syn.	(3/2-)	—	8.694·10⁷ ±3.204 keV/c²	1970
⁸⁸As	0.2 ± s	syn.	—	—	8.794·10⁷ ±215 keV/c²	1994
⁸⁹As	stab.	syn.	—	—	8.895·10⁷ ±322 keV/c²	1994
⁹⁰As	stab.	syn.	—	—	8.995·10⁷ ±429 keV/c²	1997
⁹¹As	stab.	syn.	—	—	9.096·10⁷ ±429 keV/c²	1997
⁹²As	stab.	syn.	—	—	9.196·10⁷ ±537 keV/c²	1997

63AsArsenic-63

Classification	z: 33; n: 30; m: 63
Half life	43 ns
Natural abundance	synthetic nuclide
Spin/parity	3/2-
Decay modes	proton emission
Mass excess	-33,500 ±200 keV
Binding energy	8,193 ±3 keV
Single-particle energy	-1,351 ±244 keV
Neutron separation energy	17,150 ±361 keV
Q value for electron capture	13,420 ±203.4 keV
β⁻ decay energy	-16,650 ±539 keV

Point at nuclide Decay chain of Arsenic-63

64AsArsenic-64

Classification	z: 33; n: 31; m: 64
Half life	69 ±14 ms
Natural abundance	synthetic nuclide
Decay modes	electron capture + β⁺ decay; electron capture + proton emission
Discovery	1995
Mass excess	-39,540 ±203 keV
Binding energy	8,286 ±3 keV
Single-particle energy	-100 ±200 keV
Neutron separation energy	14,100 ±285 keV
Q value for electron capture	14,780 ±203 keV
β⁻ decay energy	-12,680 ±540 keV
β⁻ decay energy with neutron	-30,760 ±540 keV

Point at nuclide Decay chain of Arsenic-64

65AsArsenic-65

Classification	z: 33; n: 32; m: 65
Half life	128 ±16 ms
Natural abundance	synthetic nuclide
Decay modes	electron capture + β⁺ decay
Discovery	1991
Mass excess	-46,940 ±84.76 keV
Binding energy	8,396 ±1.304 keV
Single-particle energy	-89.48 ±84.84 keV
Neutron separation energy	15,470 ±220 keV
Q value for electron capture	9,541 ±84.79 keV
β⁻ decay energy	-13,920 ±312 keV
β⁻ decay energy with neutron	-28,150 ±507 keV

Point at nuclide Decay chain of Arsenic-65

66AsArsenic-66

Classification	z: 33; n: 33; m: 66
Half life	95.77 ±23 ms
Natural abundance	synthetic nuclide
Spin/parity	⁰⁺
Decay modes	electron capture + β⁺ decay
Discovery	1978
Mass excess	-52,030 ±5.682 keV
Binding energy	8,468 ±0.0861 keV
Single-particle energy	2,835 ±6.08 keV
Neutron separation energy	13,150 ±84.95 keV
Q value for electron capture	9,581 ±6.168 keV
β⁻ decay energy	-10,370 ±200 keV
β⁻ decay energy with neutron	-27,080 ±300 keV

Point at nuclide Decay chain of Arsenic-66

67AsArsenic-67

Classification	z: 33; n: 34; m: 67
Half life	42.5 ±12 s
Natural abundance	synthetic nuclide
Spin/parity	(5/2-)
Decay modes	electron capture + β⁺ decay
Discovery	1980
Mass excess	-56,590 ±0.443 keV
Binding energy	8,530 ±0.0066 keV
Single-particle energy	2,269 ±2.441 keV
Neutron separation energy	12,630 ±5.699 keV
Q value for electron capture	6,086 ±4.342 keV
β⁻ decay energy	-10,010 ±67.06 keV
β⁻ decay energy with neutron	-23,000 ±200 keV

Point at nuclide Decay chain of Arsenic-67

68AsArsenic-68

Classification	z: 33; n: 35; m: 68
Half life	151.6 ±8 s
Natural abundance	synthetic nuclide
Spin/parity	3+
Decay modes	electron capture + β⁺ decay
Discovery	1971
Mass excess	-58,900 ±1.846 keV
Binding energy	8,557 ±0.0271 keV
Single-particle energy	3,509 ±4.697 keV
Neutron separation energy	10,370 ±1.898 keV
Q value for electron capture	8,084 ±2.632 keV
β⁻ decay energy	-4,706 ±1.911 keV
β⁻ decay energy with neutron	-20,390 ±67.09 keV

Point at nuclide Decay chain of Arsenic-68

69AsArsenic-69

Classification	z: 33; n: 36; m: 69
Half life	15.2 ±2 m
Natural abundance	synthetic nuclide
Spin/parity	5/2-
Decay modes	electron capture + β⁺ decay
Discovery	1955
Mass excess	-63,120 ±31.99 keV
Binding energy	8,611 ±0.4638 keV
Single-particle energy	3,422 ±32.05 keV
Neutron separation energy	12,280 ±32.05 keV
Q value for electron capture	3,988 ±32.02 keV
β⁻ decay energy	-6,678 ±32.02 keV
β⁻ decay energy with neutron	-17,000 ±32 keV
Magnetic dipole moment	1.622 ±0.002 μN

Point at nuclide Decay chain of Arsenic-69

70AsArsenic-70

Classification	z: 33; n: 37; m: 70
Half life	52.6 ±3 m
Natural abundance	synthetic nuclide
Spin/parity	4+
Decay modes	electron capture + β⁺ decay
Discovery	1950
Mass excess	-64,340 ±1.397 keV
Binding energy	8,621 ±0.02 keV
Single-particle energy	4,522 ±1.92 keV
Neutron separation energy	9,293 ±32.02 keV
Q value for electron capture	6,228 ±1.62 keV
β⁻ decay energy	-2,405 ±2.111 keV
β⁻ decay energy with neutron	-15,980 ±2.042 keV
Magnetic dipole moment	2.11 ±5·10^-4 μN
Electric quadrupole moment	0.09 ±0.02 b

Point at nuclide Decay chain of Arsenic-70

71AsArsenic-71

Classification	z: 33; n: 38; m: 71
Half life	65.3 ±7 h
Natural abundance	synthetic nuclide
Spin/parity	5/2-
Decay modes	electron capture + β⁺ decay
Discovery	1939
Mass excess	-67,900 ±4.163 keV
Binding energy	8,663 ±0.0586 keV
Single-particle energy	4,620 ±4.083 keV
Neutron separation energy	11,630 ±4.391 keV
Q value for electron capture	2,013 ±4.2 keV
β⁻ decay energy	-4,747 ±5.014 keV
β⁻ decay energy with neutron	-14,040 ±4.454 keV
Magnetic dipole moment	1.673 ±0.002 μN
Electric quadrupole moment	-0.021 ±0.006 b

Point at nuclide Decay chain of Arsenic-71

72AsArsenic-72

Classification	z: 33; n: 39; m: 72
Half life	26 ±1 h
Natural abundance	synthetic nuclide
Spin/parity	2-
Decay modes	electron capture + β⁺ decay
Discovery	1939
Mass excess	-68,230 ±4.083 keV
Binding energy	8,660 ±0.0567 keV
Single-particle energy	5,612 ±4.163 keV
Neutron separation energy	8,407 ±5.831 keV
Q value for electron capture	4,356 ±4.084 keV
β⁻ decay energy	-361.7 ±4.527 keV
β⁻ decay energy with neutron	-13,160 ±4.947 keV
Magnetic dipole moment	-2.161 ±6·10^-4 μN
Electric quadrupole moment	-0.08 ±0.02 b

Point at nuclide Decay chain of Arsenic-72

73AsArsenic-73

Classification	z: 33; n: 40; m: 73
Half life	80.3 ±6 d
Natural abundance	synthetic nuclide
Spin/parity	3/2-
Decay modes	electron capture (EC)
Discovery	1948
Mass excess	-70,960 ±3.853 keV
Binding energy	8,689 ±0.0528 keV
Single-particle energy	5,655 ±3.852 keV
Neutron separation energy	10,790 ±5.613 keV
Q value for electron capture	344.7 ±3.853 keV
β⁻ decay energy	-2,726 ±7.399 keV
β⁻ decay energy with neutron	-11,160 ±4.321 keV
Magnetic dipole moment	5.234 ±0.014 μN
Electric quadrupole moment	0.353 ±0.012 b

Point at nuclide Decay chain of Arsenic-73

74AsArsenic-74

Classification	z: 33; n: 41; m: 74
Half life	17.77 ±2 d
Natural abundance	synthetic nuclide
Spin/parity	2-
Decay modes	electron capture + β⁺ decay; β⁻ decay
Discovery	1938
Mass excess	-70,870 ±1.693 keV
Binding energy	8,680 ±0.0229 keV
Single-particle energy	6,851 ±1.694 keV
Neutron separation energy	7,978 ±4.208 keV
Q value for electron capture	2,562 ±1.693 keV
β⁻ decay energy	1,353 ±1.693 keV
β⁻ decay energy with neutron	-10,710 ±7.614 keV
Magnetic dipole moment	-1.596 ±0.003 μN

Point at nuclide Decay chain of Arsenic-74

75AsArsenic-75

Classification	z: 33; n: 42; m: 75
Half life	stable nuclide
Natural abundance	100 %
Spin/parity	3/2-
Discovery	1920
Mass excess	-73,040 ±0.884 keV
Binding energy	8,700 ±0.0118 keV
Single-particle energy	6,900 ±0.8837 keV
Neutron separation energy	10,240 ±1.909 keV
Q value for electron capture	-1,178 ±0.88 keV
β⁻ decay energy	-864.8 ±0.8816 keV
β⁻ decay energy with neutron	-8,893 ±0.8837 keV
Magnetic dipole moment	1.438 ±3·10^-4 μN
Electric quadrupole moment	0.311 ±0.002 b

Point at nuclide

76AsArsenic-76

Classification	z: 33; n: 43; m: 76
Half life	26.24 ±9 h
Natural abundance	synthetic nuclide
Spin/parity	2-
Decay modes	β⁻ decay
Discovery	1934
Mass excess	-72,300 ±0.886 keV
Binding energy	8,682 ±0.0117 keV
Single-particle energy	7,723 ±0.8877 keV
Neutron separation energy	7,328 ±0.0671 keV
Q value for electron capture	921.5 ±0.886 keV
β⁻ decay energy	2,960 ±0.8864 keV
β⁻ decay energy with neutron	-8,194 ±0.8842 keV
Magnetic dipole moment	-0.9023 ±0.001 μN

Point at nuclide Decay chain of Arsenic-76

77AsArsenic-77

Classification	z: 33; n: 44; m: 77
Half life	38.79 ±5 h
Natural abundance	synthetic nuclide
Spin/parity	3/2-
Decay modes	β⁻ decay
Discovery	1951
Mass excess	-73,920 ±1.692 keV
Binding energy	8,695 ±0.022 keV
Single-particle energy	7,992 ±1.691 keV
Neutron separation energy	9,696 ±1.909 keV
Q value for electron capture	-2,704 ±1.693 keV
β⁻ decay energy	683.1 ±1.692 keV
β⁻ decay energy with neutron	-6,736 ±1.691 keV
Magnetic dipole moment	1.294 ±0.0013 μN

Point at nuclide Decay chain of Arsenic-77

78AsArsenic-78

Classification	z: 33; n: 45; m: 78
Half life	90.7 ±2 m
Natural abundance	synthetic nuclide
Spin/parity	2-
Decay modes	β⁻ decay
Discovery	1937
Mass excess	-72,820 ±9.779 keV
Binding energy	8,673 ±0.1254 keV
Single-particle energy	8,893 ±9.779 keV
Neutron separation energy	6,971 ±9.892 keV
Q value for electron capture	-955 ±10.39 keV
β⁻ decay energy	4,208 ±9.78 keV
β⁻ decay energy with neutron	-6,289 ±9.779 keV

Point at nuclide Decay chain of Arsenic-78

79AsArsenic-79

Classification	z: 33; n: 46; m: 79
Half life	9.01 ±15 m
Natural abundance	synthetic nuclide
Spin/parity	3/2-
Decay modes	β⁻ decay
Discovery	1950
Mass excess	-73,640 ±5.325 keV
Binding energy	8,676 ±0.0674 keV
Single-particle energy	9,062 ±6.391 keV
Neutron separation energy	8,890 ±11.05 keV
Q value for electron capture	-4,109 ±37.54 keV
β⁻ decay energy	2,281 ±5.328 keV
β⁻ decay energy with neutron	-4,682 ±5.326 keV

Point at nuclide Decay chain of Arsenic-79

80AsArsenic-80

Classification	z: 33; n: 47; m: 80
Half life	15.2 ±2 s
Natural abundance	synthetic nuclide
Spin/parity	1+
Decay modes	β⁻ decay
Discovery	1954
Mass excess	-72,220 ±3.333 keV
Binding energy	8,651 ±0.0417 keV
Single-particle energy	9,976 ±37.3 keV
Neutron separation energy	6,649 ±6.269 keV
Q value for electron capture	-2,680 ±3.915 keV
β⁻ decay energy	5,544 ±3.441 keV
β⁻ decay energy with neutron	-4,369 ±3.34 keV

Point at nuclide Decay chain of Arsenic-80

81AsArsenic-81

Classification	z: 33; n: 48; m: 81
Half life	33.3 ±8 s
Natural abundance	synthetic nuclide
Spin/parity	3/2-
Decay modes	β⁻ decay
Discovery	1960
Mass excess	-72,540 ±2.644 keV
Binding energy	8,648 ±0.0326 keV
Single-particle energy	10,280 ±3.343 keV
Neutron separation energy	8,390 ±4.253 keV
Q value for electron capture	-6,242 ±3.349 keV
β⁻ decay energy	3,855 ±2.807 keV
β⁻ decay energy with neutron	-2,846 ±2.796 keV

Point at nuclide Decay chain of Arsenic-81

82AsArsenic-82

Classification	z: 33; n: 49; m: 82
Half life	19.1 ±5 s
Natural abundance	synthetic nuclide
Spin/parity	(2-)
Decay modes	β⁻ decay
Discovery	1968
Mass excess	-70,110 ±3.729 keV
Binding energy	8,611 ±0.0455 keV
Single-particle energy	11,100 ±4.252 keV
Neutron separation energy	5,643 ±4.567 keV
Q value for electron capture	-4,691 ±4.35 keV
β⁻ decay energy	7,488 ±3.757 keV
β⁻ decay energy with neutron	-1,788 ±3.854 keV

Point at nuclide Decay chain of Arsenic-82

83AsArsenic-83

Classification	z: 33; n: 50; m: 83
Half life	13.4 ±4 s
Natural abundance	synthetic nuclide
Spin/parity	(5/2-)
Decay modes	β⁻ decay
Discovery	1968
Mass excess	-69,670 ±2.799 keV
Binding energy	8,599 ±0.0337 keV
Single-particle energy	11,540 ±3.578 keV
Neutron separation energy	7,635 ±4.657 keV
Q value for electron capture	-8,693 ±3.705 keV
β⁻ decay energy	5,671 ±4.129 keV
β⁻ decay energy with neutron	-146.8 ±2.837 keV

Point at nuclide Decay chain of Arsenic-83

84AsArsenic-84

Classification	z: 33; n: 51; m: 84
Half life	4.2 ±5 s
Natural abundance	synthetic nuclide
Spin/parity	(3-)
Decay modes	β⁻ decay; β⁻ decay with neutron emission
Discovery	1968
Mass excess	-65,860 ±3.171 keV
Binding energy	8,547 ±0.0377 keV
Single-particle energy	12,160 ±3.987 keV
Neutron separation energy	4,255 ±4.223 keV
Q value for electron capture	-7,706 ±4.484 keV
β⁻ decay energy	10,090 ±3.721 keV
β⁻ decay energy with neutron	1,415 ±4.389 keV

Point at nuclide Decay chain of Arsenic-84

85AsArsenic-85

Classification	z: 33; n: 52; m: 85
Half life	2.021 ±12 s
Natural abundance	synthetic nuclide
Spin/parity	(3/2-)
Decay modes	β⁻ decay; β⁻ decay with neutron emission
Discovery	1967
Mass excess	-63,190 ±3.078 keV
Binding energy	8,510 ±0.0362 keV
Single-particle energy	12,320 ±4.413 keV
Neutron separation energy	5,406 ±4.413 keV
Q value for electron capture	-10,070 ±4.835 keV
β⁻ decay energy	9,224 ±4.031 keV
β⁻ decay energy with neutron	4,687 ±3.643 keV

Point at nuclide Decay chain of Arsenic-85

86AsArsenic-86

Classification	z: 33; n: 53; m: 86
Half life	0.945 ±8 s
Natural abundance	synthetic nuclide
Decay modes	β⁻ decay; β⁻ decay with neutron emission; β⁻ decay with two-neutron emission
Discovery	1973
Mass excess	-58,970 ±3.45 keV
Binding energy	8,456 ±0.0401 keV
Single-particle energy	13,120 ±5.075 keV
Neutron separation energy	3,844 ±4.618 keV
Q value for electron capture	-9,563 ±437.8 keV
β⁻ decay energy	11,540 ±4.266 keV
β⁻ decay energy with neutron	5,380 ±4.322 keV

Point at nuclide Decay chain of Arsenic-86

87AsArsenic-87

Classification	z: 33; n: 54; m: 87
Half life	484 ±40 ms
Natural abundance	synthetic nuclide
Spin/parity	(3/2-)
Decay modes	β⁻ decay; β⁻ decay with neutron emission
Discovery	1970
Mass excess	-55,620 ±2.985 keV
Binding energy	8,413 ±0.0343 keV
Single-particle energy	13,500 ±437.8 keV
Neutron separation energy	4,727 ±4.556 keV
Q value for electron capture	-12,030 ±300 keV
β⁻ decay energy	10,800 ±3.726 keV
β⁻ decay energy with neutron	6,813 ±3.9 keV

Point at nuclide Decay chain of Arsenic-87

88AsArsenic-88

Classification	z: 33; n: 55; m: 88
Half life	0.2 ± s
Natural abundance	synthetic nuclide
Decay modes	β⁻ decay; β⁻ decay with neutron emission
Discovery	1994
Mass excess	-50,450 ±200 keV
Binding energy	8,351 ±2 keV
Single-particle energy	14,140 ±361 keV
Neutron separation energy	2,903 ±200 keV
Q value for electron capture	-10,930 ±447.2 keV
β⁻ decay energy	13,430 ±200 keV
β⁻ decay energy with neutron	7,905 ±200 keV

Point at nuclide Decay chain of Arsenic-88

89AsArsenic-89

Classification	z: 33; n: 56; m: 89
Half life	stable nuclide
Natural abundance	synthetic nuclide
Discovery	1994
Mass excess	-46,530 ±300 keV
Binding energy	8,304 ±3 keV
Single-particle energy	14,290 ±500 keV
Neutron separation energy	4,152 ±361 keV
Q value for electron capture	-13,490 ±500 keV
β⁻ decay energy	12,460 ±300 keV
β⁻ decay energy with neutron	9,283 ±300 keV

Point at nuclide

90AsArsenic-90

Classification	z: 33; n: 57; m: 90
Half life	stable nuclide
Natural abundance	synthetic nuclide
Discovery	1997
Mass excess	-40,990 ±400 keV
Binding energy	8,240 ±4 keV
Single-particle energy	15,230 ±565 keV
Neutron separation energy	2,532 ±500 keV
Q value for electron capture	-12,520 ±640.3 keV
β⁻ decay energy	14,810 ±518 keV
β⁻ decay energy with neutron	9,931 ±400 keV

Point at nuclide

91AsArsenic-91

Classification	z: 33; n: 58; m: 91
Half life	stable nuclide
Natural abundance	synthetic nuclide
Discovery	1997
Mass excess	-36,500 ±400 keV
Binding energy	8,189 ±4 keV
Single-particle energy	15,310 ±640 keV
Neutron separation energy	3,581 ±565 keV
β⁻ decay energy	14,080 ±589 keV
β⁻ decay energy with neutron	11,220 ±518 keV

Point at nuclide

92AsArsenic-92

Classification	z: 33; n: 59; m: 92
Half life	stable nuclide
Natural abundance	synthetic nuclide
Discovery	1997
Mass excess	-30,380 ±500 keV
Binding energy	8,121 ±5 keV
Neutron separation energy	1,951 ±640 keV
β⁻ decay energy	16,340 ±640 keV
β⁻ decay energy with neutron	12,120 ±662 keV

Point at nuclide

Isotopes of Arsenic

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