Isotopes of Potassium

List of known isotopes of the element Potassium.

Isotope	t½	%	Spin/parity	Radius	Isotopic mass	Discovery
³¹K	10 ps	syn.	—	—	3.103·10⁷ ±322 keV/c²	2019
³³K	25 ns	syn.	—	—	3.3·10⁷ ±215 keV/c²	—
³⁴K	25 ns	syn.	—	—	3.399·10⁷ ±210 keV/c²	—
³⁵K	178 ±8 ms	syn.	(3/2)+	—	3.498·10⁷ ±0.55 keV/c²	1976
³⁶K	341 ±3 ms	syn.	2+	—	3.598·10⁷ ±0.349 keV/c²	1967
³⁷K	1.225 ±7 s	syn.	3/2+	—	3.697·10⁷ ±0.1 keV/c²	1958
³⁸K	7.651 ±19 m	syn.	3+	3.426 ±0.0051 fm	3.796·10⁷ ±0.209 keV/c²	1937
³⁹K	stab.	93.25 ±0.0044 %	3/2+	3.434 ±0.0019 fm	3.896·10⁷ ±0.00489 keV/c²	1921
⁴⁰K	1.248·10⁹ ±3 a	0.0117 ±1·10^-4 %	4-	3.438 ±0.0028 fm	3.996·10⁷ ±0.06 keV/c²	1935
⁴¹K	stab.	6.73 ±0.0044 %	3/2+	3.451 ±0.0055 fm	4.096·10⁷ ±0.00403 keV/c²	1921
⁴²K	12.35 ±7 h	syn.	2-	3.451 ±0.007 fm	4.196·10⁷ ±0.113 keV/c²	1935
⁴³K	22.3 ±1 h	syn.	3/2+	3.455 ±0.0086 fm	4.296·10⁷ ±0.44 keV/c²	1949
⁴⁴K	22.13 ±19 m	syn.	2-	3.456 ±0.0101 fm	4.396·10⁷ ±0.45 keV/c²	1954
⁴⁵K	17.81 ±61 m	syn.	3/2+	3.46 ±0.0118 fm	4.496·10⁷ ±0.56 keV/c²	1964
⁴⁶K	105 ±10 s	syn.	(2-)	3.455 ±0.0126 fm	4.596·10⁷ ±0.78 keV/c²	1965
⁴⁷K	17.5 ±24 s	syn.	1/2+	3.453 ±0.0138 fm	4.696·10⁷ ±1.5 keV/c²	1964
⁴⁸K	6.8 ±2 s	syn.	1(-)	—	4.796·10⁷ ±0.83 keV/c²	1972
⁴⁹K	1.26 ±5 s	syn.	(1/2+ 3/2+)	—	4.896·10⁷ ±0.86 keV/c²	1972
⁵⁰K	472 ±4 ms	syn.	0(-)	—	4.997·10⁷ ±8.3 keV/c²	1972
⁵¹K	365 ±5 ms	syn.	3/2+	—	5.097·10⁷ ±14 keV/c²	1983
⁵²K	110 ±6 ms	syn.	(2-)	—	5.198·10⁷ ±36 keV/c²	1983
⁵³K	30 ±5 ms	syn.	(3/2+)	—	5.298·10⁷ ±120 keV/c²	1983
⁵⁴K	10 ±5 ms	syn.	2-	—	5.399·10⁷ ±429 keV/c²	1983
⁵⁵K	stab.	syn.	(3/2+)	—	5.5·10⁷ ±537 keV/c²	2009
⁵⁶K	stab.	syn.	—	—	5.6·10⁷ ±644 keV/c²	2009

31KPotassium-31

Classification	z: 19; n: 12; m: 31
Half life	10 ps
Natural abundance	synthetic nuclide
Decay modes	proton emission
Discovery	2019
Mass excess	34,260 ±300 keV
Binding energy	6,487 ±10 keV
Single-particle energy	-4,900 ±349 keV

Point at nuclide Decay chain of Potassium-31

33KPotassium-33

Classification	z: 19; n: 14; m: 33
Half life	25 ns
Natural abundance	synthetic nuclide
Decay modes	proton emission
Mass excess	7,540 ±200 keV
Binding energy	7,392 ±6 keV
Single-particle energy	-2,452 ±200 keV
Neutron separation energy	22,520 ±447 keV
Q value for electron capture	16,920 ±200 keV
β⁻ decay energy	-23,490 ±447 keV

Point at nuclide Decay chain of Potassium-33

34KPotassium-34

Classification	z: 19; n: 15; m: 34
Half life	25 ns
Natural abundance	synthetic nuclide
Decay modes	proton emission
Mass excess	-1,220 ±196 keV
Binding energy	7,670 ±6 keV
Single-particle energy	-875 ±196 keV
Neutron separation energy	16,830 ±280 keV
Q value for electron capture	17,150 ±196 keV
β⁻ decay energy	-16,110 ±358 keV
β⁻ decay energy with neutron	-40,330 ±445 keV

Point at nuclide Decay chain of Potassium-34

35KPotassium-35

Classification	z: 19; n: 16; m: 35
Half life	178 ±8 ms
Natural abundance	synthetic nuclide
Spin/parity	(3/2)+
Decay modes	electron capture + β⁺ decay; electron capture + proton emission
Discovery	1976
Mass excess	-11,180 ±0.512 keV
Binding energy	7,965 ±0.0146 keV
Single-particle energy	83.57 ±0.5182 keV
Neutron separation energy	18,020 ±196 keV
Q value for electron capture	11,870 ±0.851 keV
β⁻ decay energy	-16,370 ±200 keV
β⁻ decay energy with neutron	-34,140 ±300 keV
Magnetic dipole moment	0.392 ±0.007 μN

Point at nuclide Decay chain of Potassium-35

36KPotassium-36

Classification	z: 19; n: 17; m: 36
Half life	341 ±3 ms
Natural abundance	synthetic nuclide
Spin/parity	2+
Decay modes	electron capture + β⁺ decay; electron capture + proton emission; electron capture + α decay
Discovery	1967
Mass excess	-17,420 ±0.325 keV
Binding energy	8,142 ±0.009 keV
Single-particle energy	1,658 ±0.754 keV
Neutron separation energy	14,310 ±0.6068 keV
Q value for electron capture	12,810 ±0.32 keV
β⁻ decay energy	-10,970 ±40 keV
β⁻ decay energy with neutron	-30,680 ±200 keV
Magnetic dipole moment	0.548 ±0.001 μN

Point at nuclide Decay chain of Potassium-36

37KPotassium-37

Classification	z: 19; n: 18; m: 37
Half life	1.225 ±7 s
Natural abundance	synthetic nuclide
Spin/parity	3/2+
Decay modes	electron capture + β⁺ decay
Discovery	1958
Mass excess	-24,810 ±0.094 keV
Binding energy	8,339 ±0.0025 keV
Single-particle energy	1,857 ±0.09 keV
Neutron separation energy	15,450 ±0.3381 keV
Q value for electron capture	6,147 ±0.227 keV
β⁻ decay energy	-11,670 ±0.6412 keV
β⁻ decay energy with neutron	-26,430 ±40 keV
Magnetic dipole moment	0.2032 ±6·10^-5 μN
Electric quadrupole moment	0.109 ±0.004 b

Point at nuclide Decay chain of Potassium-37

38KPotassium-38

Classification	z: 19; n: 19; m: 38
Half life	7.651 ±19 m
Natural abundance	synthetic nuclide
Spin/parity	3+
Decay modes	electron capture + β⁺ decay
Discovery	1937
Mass excess	-28,810 ±0.195 keV
Binding energy	8,438 ±0.0051 keV
Single-particle energy	5,142 ±0.2843 keV
Neutron separation energy	12,070 ±0.2167 keV
Q value for electron capture	5,914 ±0.276 keV
β⁻ decay energy	-6,743 ±0.0626 keV
β⁻ decay energy with neutron	-23,740 ±0.6637 keV
Magnetic dipole moment	1.371 ±0.006 μN

Point at nuclide Decay chain of Potassium-38

39KPotassium-39

Classification	z: 19; n: 20; m: 39
Half life	stable nuclide
Natural abundance	93.25 ±0.0044 %
Spin/parity	3/2+
Discovery	1921
Mass excess	-33,810 ±0.00456 keV
Binding energy	8,557 ±3·10^-4 keV
Single-particle energy	6,381 ±0.195 keV
Neutron separation energy	13,070 ±0.1953 keV
Q value for electron capture	-565 ±5 keV
β⁻ decay energy	-6,525 ±0.5962 keV
β⁻ decay energy with neutron	-19,830 ±0.1944 keV
Magnetic dipole moment	0.3914 ±8·10^-6 μN
Electric quadrupole moment	0.603 ±0.006 b

Point at nuclide

40KPotassium-40

Classification	z: 19; n: 21; m: 40
Half life	1.248·10⁹ ±3 a
Natural abundance	0.0117 ±1·10^-4 %
Spin/parity	4-
Decay modes	β⁻ decay; electron capture + β⁺ decay
Discovery	1935
Mass excess	-33,540 ±0.056 keV
Binding energy	8,538 ±0.0014 keV
Single-particle energy	7,582 ±5 keV
Neutron separation energy	7,799 ±0.0559 keV
Q value for electron capture	1,504 ±0.056 keV
β⁻ decay energy	1,310 ±0.0596 keV
β⁻ decay energy with neutron	-14,330 ±0.5988 keV
Magnetic dipole moment	-1.298 ±3·10^-5 μN
Electric quadrupole moment	-0.75 ±0.008 b

Point at nuclide Decay chain of Potassium-40

41KPotassium-41

Classification	z: 19; n: 22; m: 41
Half life	stable nuclide
Natural abundance	6.73 ±0.0044 %
Spin/parity	3/2+
Discovery	1921
Mass excess	-35,560 ±0.00376 keV
Binding energy	8,576 ±3·10^-4 keV
Single-particle energy	7,808 ±0.0031 keV
Neutron separation energy	10,090 ±0.056 keV
Q value for electron capture	-2,493 ±0.347 keV
β⁻ decay energy	-421.7 ±0.1377 keV
β⁻ decay energy with neutron	-8,785 ±0.0208 keV
Magnetic dipole moment	0.2148 ±5·10^-6 μN
Electric quadrupole moment	0.734 ±0.007 b

Point at nuclide

42KPotassium-42

Classification	z: 19; n: 23; m: 42
Half life	12.35 ±7 h
Natural abundance	synthetic nuclide
Spin/parity	2-
Decay modes	β⁻ decay
Discovery	1935
Mass excess	-35,030 ±0.106 keV
Binding energy	8,551 ±0.0025 keV
Single-particle energy	9,243 ±0.3631 keV
Neutron separation energy	7,533 ±0.1061 keV
Q value for electron capture	-599.4 ±5.776 keV
β⁻ decay energy	3,525 ±0.1825 keV
β⁻ decay energy with neutron	-7,956 ±0.1738 keV
Magnetic dipole moment	-1.143 ±6·10^-4 μN

Point at nuclide Decay chain of Potassium-42

43KPotassium-43

Classification	z: 19; n: 24; m: 43
Half life	22.3 ±1 h
Natural abundance	synthetic nuclide
Spin/parity	3/2+
Decay modes	β⁻ decay
Discovery	1949
Mass excess	-36,580 ±0.41 keV
Binding energy	8,576 ±0.0095 keV
Single-particle energy	9,441 ±5.789 keV
Neutron separation energy	9,624 ±0.4234 keV
Q value for electron capture	-4,566 ±5.326 keV
β⁻ decay energy	1,833 ±0.4687 keV
β⁻ decay energy with neutron	-6,100 ±0.4359 keV
Magnetic dipole moment	0.1633 ±8·10^-4 μN

Point at nuclide Decay chain of Potassium-43

44KPotassium-44

Classification	z: 19; n: 25; m: 44
Half life	22.13 ±19 m
Natural abundance	synthetic nuclide
Spin/parity	2-
Decay modes	β⁻ decay
Discovery	1954
Mass excess	-35,790 ±0.419 keV
Binding energy	8,546 ±0.0095 keV
Single-particle energy	11,060 ±5.326 keV
Neutron separation energy	7,277 ±0.5862 keV
Q value for electron capture	-3,109 ±1.638 keV
β⁻ decay energy	5,687 ±0.5303 keV
β⁻ decay energy with neutron	-5,444 ±0.4769 keV
Magnetic dipole moment	-0.856 ±0.004 μN

Point at nuclide Decay chain of Potassium-44

45KPotassium-45

Classification	z: 19; n: 26; m: 45
Half life	17.81 ±61 m
Natural abundance	synthetic nuclide
Spin/parity	3/2+
Decay modes	β⁻ decay
Discovery	1964
Mass excess	-36,620 ±0.522 keV
Binding energy	8,554 ±0.0116 keV
Single-particle energy	11,230 ±1.667 keV
Neutron separation energy	8,905 ±0.6692 keV
Q value for electron capture	-6,845 ±0.731 keV
β⁻ decay energy	4,196 ±0.6369 keV
β⁻ decay energy with neutron	-3,219 ±0.6145 keV
Magnetic dipole moment	0.1734 ±8·10^-4 μN

Point at nuclide Decay chain of Potassium-45

46KPotassium-46

Classification	z: 19; n: 27; m: 46
Half life	105 ±10 s
Natural abundance	synthetic nuclide
Spin/parity	(2-)
Decay modes	β⁻ decay
Discovery	1965
Mass excess	-35,420 ±0.727 keV
Binding energy	8,518 ±0.0158 keV
Single-particle energy	12,930 ±0.889 keV
Neutron separation energy	6,869 ±0.8944 keV
Q value for electron capture	-5,643 ±2.44 keV
β⁻ decay energy	7,725 ±2.349 keV
β⁻ decay energy with neutron	-2,674 ±0.8133 keV
Magnetic dipole moment	-1.051 ±0.006 μN

Point at nuclide Decay chain of Potassium-46

47KPotassium-47

Classification	z: 19; n: 28; m: 47
Half life	17.5 ±24 s
Natural abundance	synthetic nuclide
Spin/parity	1/2+
Decay modes	β⁻ decay
Discovery	1964
Mass excess	-35,720 ±1.397 keV
Binding energy	8,514 ±0.0297 keV
Single-particle energy	13,220 ±2.715 keV
Neutron separation energy	8,369 ±1.574 keV
Q value for electron capture	-10,350 ±1.849 keV
β⁻ decay energy	6,632 ±2.623 keV
β⁻ decay energy with neutron	-643.7 ±2.634 keV
Magnetic dipole moment	1.933 ±0.009 μN

Point at nuclide Decay chain of Potassium-47

48KPotassium-48

Classification	z: 19; n: 29; m: 48
Half life	6.8 ±2 s
Natural abundance	synthetic nuclide
Spin/parity	1(-)
Decay modes	β⁻ decay; β⁻ decay with neutron emission
Discovery	1972
Mass excess	-32,290 ±0.773 keV
Binding energy	8,434 ±0.0161 keV
Single-particle energy	14,200 ±1.436 keV
Neutron separation energy	4,643 ±1.596 keV
Q value for electron capture	-9,930 ±16.78 keV
β⁻ decay energy	11,940 ±0.7734 keV
β⁻ decay energy with neutron	1,988 ±2.351 keV

Point at nuclide Decay chain of Potassium-48

49KPotassium-49

Classification	z: 19; n: 30; m: 49
Half life	1.26 ±5 s
Natural abundance	synthetic nuclide
Spin/parity	(1/2+ 3/2+)
Decay modes	β⁻ decay; β⁻ decay with neutron emission
Discovery	1972
Mass excess	-29,620 ±0.801 keV
Binding energy	8,372 ±0.0164 keV
Single-particle energy	14,540 ±16.78 keV
Neutron separation energy	5,398 ±1.113 keV
Q value for electron capture	-12,560 ±400 keV
β⁻ decay energy	11,680 ±0.8205 keV
β⁻ decay energy with neutron	6,542 ±0.8013 keV
Magnetic dipole moment	1.338 ±8·10^-4 μN

Point at nuclide Decay chain of Potassium-49

50KPotassium-50

Classification	z: 19; n: 31; m: 50
Half life	472 ±4 ms
Natural abundance	synthetic nuclide
Spin/parity	0(-)
Decay modes	β⁻ decay; β⁻ decay with neutron emission; β⁻ decay with two-neutron emission
Discovery	1972
Mass excess	-25,730 ±7.731 keV
Binding energy	8,288 ±0.1546 keV
Single-particle energy	15,950 ±400 keV
Neutron separation energy	4,187 ±7.772 keV
Q value for electron capture	-12,500 ±500 keV
β⁻ decay energy	13,860 ±7.891 keV
β⁻ decay energy with neutron	7,500 ±7.733 keV

Point at nuclide Decay chain of Potassium-50

51KPotassium-51

Classification	z: 19; n: 32; m: 51
Half life	365 ±5 ms
Natural abundance	synthetic nuclide
Spin/parity	3/2+
Decay modes	β⁻ decay; β⁻ decay with neutron emission
Discovery	1983
Mass excess	-22,520 ±13.04 keV
Binding energy	8,221 ±0.2557 keV
Single-particle energy	16,570 ±500 keV
Neutron separation energy	4,858 ±15.16 keV
Q value for electron capture	-16,030 ±400.2 keV
β⁻ decay energy	13,810 ±13.05 keV
β⁻ decay energy with neutron	9,002 ±13.13 keV
Magnetic dipole moment	0.513 ±0.002 μN

Point at nuclide Decay chain of Potassium-51

52KPotassium-52

Classification	z: 19; n: 33; m: 52
Half life	110 ±6 ms
Natural abundance	synthetic nuclide
Spin/parity	(2-)
Decay modes	β⁻ decay; β⁻ decay with neutron emission; β⁻ decay with two-neutron emission
Discovery	1983
Mass excess	-17,140 ±33.53 keV
Binding energy	8,115 ±0.6449 keV
Single-particle energy	17,930 ±401 keV
Neutron separation energy	2,693 ±35.98 keV
Q value for electron capture	-15,760 ±600.9 keV
β⁻ decay energy	17,120 ±33.54 keV
β⁻ decay energy with neutron	11,120 ±33.53 keV

Point at nuclide Decay chain of Potassium-52

53KPotassium-53

Classification	z: 19; n: 34; m: 53
Half life	30 ±5 ms
Natural abundance	synthetic nuclide
Spin/parity	(3/2+)
Decay modes	β⁻ decay; β⁻ decay with neutron emission; β⁻ decay with two-neutron emission
Discovery	1983
Mass excess	-12,300 ±111.7 keV
Binding energy	8,022 ±2.109 keV
Single-particle energy	18,200 ±610 keV
Neutron separation energy	3,229 ±116.7 keV
Q value for electron capture	-19,090 ±707.8 keV
β⁻ decay energy	17,090 ±120 keV
β⁻ decay energy with neutron	13,890 ±111.7 keV

Point at nuclide Decay chain of Potassium-53

54KPotassium-54

Classification	z: 19; n: 35; m: 54
Half life	10 ±5 ms
Natural abundance	synthetic nuclide
Spin/parity	2-
Decay modes	β⁻ decay; β⁻ decay with two-neutron emission; β⁻ decay with neutron emission
Discovery	1983
Mass excess	-5,150 ±400 keV
Binding energy	7,891 ±7 keV
Single-particle energy	19,230 ±805 keV
Neutron separation energy	926 ±415 keV
β⁻ decay energy	20,010 ±403 keV
β⁻ decay energy with neutron	16,160 ±402 keV

Point at nuclide Decay chain of Potassium-54

55KPotassium-55

Classification	z: 19; n: 36; m: 55
Half life	stable nuclide
Natural abundance	synthetic nuclide
Spin/parity	(3/2+)
Discovery	2009
Mass excess	470 ±500 keV
Binding energy	7,792 ±9 keV
Single-particle energy	19,370 ±944 keV
Neutron separation energy	2,451 ±640 keV
β⁻ decay energy	19,120 ±525 keV
β⁻ decay energy with neutron	17,560 ±503 keV

Point at nuclide

56KPotassium-56

Classification	z: 19; n: 37; m: 56
Half life	stable nuclide
Natural abundance	synthetic nuclide
Discovery	2009
Mass excess	7,980 ±600 keV
Binding energy	7,663 ±11 keV
Neutron separation energy	562 ±781 keV
β⁻ decay energy	21,490 ±650 keV
β⁻ decay energy with neutron	18,550 ±621 keV

Point at nuclide

Isotopes of Potassium

31KPotassium-31ads_clickcall_splitdownload

33KPotassium-33ads_clickcall_splitdownload

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31KPotassium-31

33KPotassium-33

34KPotassium-34

35KPotassium-35

36KPotassium-36

37KPotassium-37

38KPotassium-38

39KPotassium-39

40KPotassium-40

41KPotassium-41

42KPotassium-42

43KPotassium-43

44KPotassium-44

45KPotassium-45

46KPotassium-46

47KPotassium-47

48KPotassium-48

49KPotassium-49

50KPotassium-50

51KPotassium-51

52KPotassium-52

53KPotassium-53

54KPotassium-54

55KPotassium-55

56KPotassium-56