List of isotopes / atomic number 11 to atomic number 20

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The list of isotopes is the overview page for easy access to all elements. The structure is also explained there and the legend for the table can also be found there. Decay energies were recalculated with the given masses and the mass-energy equivalent of . ${\displaystyle \textstyle \Delta m=931{,}4940954{\frac {\mathrm {MeV} }{\mathrm {u} }}}$

₁₁ sodium

isotope	Half-life	Decay energy (MeV)	Spin / parity	Type (s) of decay (%)	NH (%)	Mass (u)
18 Well	1.3 · 10 −21 s	1.249	1−	p		18,026 88 (12)
19 Well	<40 ns	0.3225	5/2 +	p		19.013 880 (11)
20 Well	447.9 ms	13.893 (β + ), 9.163 (β + α)	2+	β + = 79.95, β + α = 20.05		20.007 3544 (12)
21 Well	22.49 s	3,547	3/2 +	β +		20.997 654 69 (30)
22 Well	2.6027 a	2.843	3+	β +		21,994 437 41 (18)
22m1 Na	244 ns	0.5825	1+	IT		21.995 062 77
23 Well	stable		3/2 +		100	22.989 769 2820 (19)
24 Well	14.997 h	5.5156	4+	β -		23.990 962 950 (38)
24m1 Na	20.18 ms	0.472 (IT), 5.988 (β - )	1+	IT = 99.95, β - = 0.05		23,991 469 83
25 Well	59.1 s	3.835	5/2 +	β -		24.989 9540 (13)
26 Well	1.07128 s	9,353	3+	β -		25.992 6346 (38)
27 Well	301 ms	9.069 (β - ), 2.626 (β - n)	5/2 +	β - = 99.87, β - n = 0.13		26.994 0765 (40)
28 Well	30.5 ms	14.03 (β - ), 5.527 (β - n)	1+	β - = 99.42, β - n = 0.58		27.998 939 (11)
29 Well	44.9 ms	13.283 (β - ), 9.627 (β - n)	3/2 +	β - = 78.5, β - n = 21.5		29.002 8771 (79)
30 Well	48 ms	17.358 (β - ), 11.007 (β - n), 7.351 (β - 2n), 5.57 (β - α)	2+	β - = 68.85, β - n = 30, β - 2n = 1.17, β - α = 5.5 · 10 −5		30.009 0979 (51)
31 Well	17 ms	15.384 (β - ), 13.074 (β - n), 6.722 (β - 2n), 3.066 (β - 3n)	3/2 +	β - = 61.93, β - n = 37, β - 2n = 0.87, β - 3n = 0.2		31,013 163 (25)
32 Well	13.2 ms	19.636 (β - ), 13.858 (β - n), 11.548 (β - 2n)	3−	β - = 68, β - n = 24, β - 2n = 8		32.020 19 (13)
33 Well	8 ms	19.005 (β - ), 16.725 (β - n), 10.947 (β - 2n)	3/2 +	β - = 40, β - n = 47, β - 2n = 13		33.025 73 (64 #)
34 Well	5.5 ms	22.966 (β - ), 18.255 (β - n), 15.975 (β - 2n)		β - = 35, β - n ≈ 15, β - 2n ≈ 50		34,033 59 (54 #)
35 Well	1.5 ms	22.198 (β - ), 21.443 (β - n)		β - = 50, β - n = 50		35.040 62 (63 #)
36 Well	<180 ns	0.00474	1+	n		36,049 29 (64 #)
37 Well	> 60 ns	24.852 (β - ), 24.689 (β - n)	3/2 +	β - =?, β - n =?		37.057 05 (65 #)

₁₂ magnesium

isotope	Half-life	Decay energy (MeV)	Spin / parity	Type (s) of decay (%)	NH (%)	Mass (u)
19 mg	4 ps	0.7498	1 / 2−	2p		19,034 169 (54)
20 mg	90.8 ms	10.708 (β + ), 8.518 (β + p)	0+	β + = 73, β + p = 27		20.018 850 (29)
21 mg	122 ms	13.098 (β + ), 10.666 (β + p), 6.537 (β + α)	5/2 +	β + = 66.9, β + p = 32.6, β + α = 0.5		21.011 716 (18)
22 mg	3.8755 s	4,782	0+	β +		21.999 570 65 (34)
23 mg	11.317 s	4.057	5/2 +	ε		22.994 124 21 (74)
23m1 mg	15 · 10 −15 s	9.596 (IT), 2.016 (p)	3/2 +	IT =?, P =?		23.004 426 22
24 mg	stable		0+		078.99	23.985 041 697 (14)
25 mg	stable		5/2 +		010.00	24.985 836 976 (50)
26 mg	stable		0+		011.01	25.982 592 968 (31)
27 mg	9.458 min	2.61	1/2 +	β -		26.984 340 624 (53)
28 mg	20.915 h	1,832	0+	β -		27.983 8767 (22)
29 mg	1.3 s	7.601	3/2 +	β -		28,988 617 (12)
30 mg	335 ms	6,989	0+	β -		29.990 4629 (37)
31 mg	232 ms	11.833 (β - ), 4.679 (β - n)	1/2 +	β - = 98.3, β - n = 1.7		30.996 6480 (33)
32 mg	86 ms	10.27 (β - ), 6.055 (β - n)	0+	β - = 94.5, β - n = 5.5		31.999 1102 (34)
33 mg	90.5 ms	13.43 (β - ), 7.99 (β - n)	3/2 +	β - = 83, β - n = 17		33.005 3271 (31)
34 mg	20 ms	11.392 (β - ), 8.72 (β - n)	0+	β - = 90, β - n = 10		34.008 935 (31)
35 mg	70 ms	15.86 (β - ), 10.638 (β - n)	7 / 2−	β - = 48, β - n = 52		35,016 79 (19)
36 mg	3.9 ms	14.429 (β - ), 12.53 (β - n)	0+	β - = 60, β - n = 40		36,021 88 (49)
37 mg	40 ms	18.48 (β - ), 14.266 (β - n)	7 / 2−	β - <100, β - n =?		37.030 37 (54 #)
38 mg	1 ms	17.866 (β - ), 16.194 (β - n)	0+	β - =?, β - n =?		38,036 58 (54 #)
39 mg	<180 ns	0.1258	7 / 2−	n		39.045 38 (55 #)
40 mg	1 ms	20.633 (β - ), 19.538 (β - n)	0+	β - =?, β - n =?		40.052 18 (64 #)

₁₃ aluminum

isotope	Half-life	Decay energy (MeV)	Spin / parity	Type (s) of decay (%)	NH (%)	Mass (u)
21 al	100 ps	2,318	5/2 +	p		21.028 97 (43 #)
22 Al	91.1 ms	18.601 (β + ), 13.097 (εp), 10.665 (ε2p), 10.459 (εα)	3+	β + = 44.36, εp = 54.5, ε2p = 1.1, εα = 0.04		22.019 54 (43 #)
23 Al	446 ms	12.221 (β + ), 4.641 (β + p)	5/2 +	β + = 99.53, β + p = 0.47		23.007 244 35 (37)
23m1 Al	6.2 · 10 −18 s	0.43 (p), 0.571 (IT)	1/2 +	p ≈ 100, IT = 8.5 · 10 −7		23, 007 857 27
24 al	2.053 s	13.886 (β + ), 2.193 (εp), 4.569 (εα)	4+	β + = 99.96, εp = 0.0016, εα = 0.0384		23.999 9489 (12)
24m1 Al	130 ms	0.417 (IT), 14.303 (β + ), 4.987 (εα)	1+	IT = 82.5, β + = 17.47, εα = 0.03		24,000 397
25 Al	7.183 s	4,277	5/2 +	β +		24.990 428 10 (51)
26 Al	7.17 · 10 5 a	4.004	5+	ε		25.986 891 904 (69)
26m1 Al	6.3464 s	4.233	0+	ε		25.987 136 79
27 Al	stable		5/2 +		100	26.981 538 53 (11)
28 Al	2.2414 min	4,642	3+	β -		27.981 910 21 (13)
29 Al	6.56 min	3.69	5/2 +	β -		28.980 4565 (10)
30 al	3.62 s	8.56	3+	β -		29.982 960 (15)
31 al	644 ms	7,994	5/2 +	β -		30.983 945 (22)
32 Al	33 ms	12.979	1+	β -		31,988 085 (13)
32m1 Al	200 ns	0.99435	4+	IT		31.989 152 48
33 Al	41.7 ms	12.046 (β - ), 7.538 (β - n)	5/2 +	β - = 91.5, β - n = 8.5		32,990 909 (81)
34 al	42 ms	16.887 (β - ), 9.374 (β - n)	4−	β - = 73, β - n = 27		33.996 705 (74)
35 al	37.2 ms	14.141 (β - ), 11.665 (β - n)	5/2 +	β - = 59, β - n = 41		34.999 764 (75)
36 al	90 ms	18.346 (β - ), 12.242 (β - n)		β - = 70, β - n = 30		36.006 39 (11)
37 Al	10.7 ms	16.403 (β - ), 14.131 (β - n)		β - = 85, β - n = 15		37.010 53 (13)
38 Al	7.6 ms	20.378 (β - ), 14.731 (β - n)		β - =?, β - n =?		38.017 40 (27)
39 Al	7.6 ms	18.676 (β - ), 17.095 (β - n)		β - =?, β - n =?		39.022 54 (54 #)
40 al	> 260 ns	22.542 (β - ), 17.581 (β - n)		β - =?, β - n =?		40.030 03 (54 #)
41 Al	> 260 ns	21.769 (β - ), 20.386 (β - n)		β - =?, β - n =?		41,036 38 (64 #)
42 Al	> 170 ns	24.275 (β - ), 20.647 (β - n)		β - =?, β - n =?		42.043 84 (64 #)
43 Al	> 170 ns	24.843 (β - ), 23.311 (β - n)		β - =?, β - n =?		43.051 47 (75 #)

₁₄ silicon

isotope	Half-life	Decay energy (MeV)	Spin / parity	Type (s) of decay (%)	NH (%)	Mass (u)
22 Si	29 ms	15.137 (β + ), 15.136 (εp)	0+	β + = 68, εp = 32		22.035 79 (54 #)
23 Si	42.3 ms	16.949 (β + ), 16.808 (εp), 11.304 (ε2p)	5/2 +	β + = 25.4, εp = 71, ε2p = 3.6		23.025 44 (54 #)
24 Si	140.5 ms	10.792 (β + ), 8.929 (εp)	0+	β + = 62, εp = 38		24.011 535 (21)
25 Si	220 ms	12.744 (β + ), 10.472 (β + p)	5/2 +	β + = 65, β + p = 35		25.004 109 (11)
26 Si	2.229 s	5.069	0+	β +		25.992 333 84 (11)
27 Si	4.15 s	4.812	5/2 +	ε		26.986 704 81 (15)
28 Si	stable		0+		092.223	27.976 926 534 65 (44)
29 Si	stable		1/2 +		004.685	28.976 494 664 90 (52)
30 Si	stable		0+		003.092	29.973 770 136 (23)
31 Si	157.3 min	1.492	3/2 +	β -		30.975 363 194 (46)
32 Si	153 a	0.227	0+	β -		31.974 151 54 (32)
33 Si	6.11 s	5.823	3/2 +	β -		32.977 976 96 (75)
34 Si	2.77 s	4,592	0+	β -		33.978 576 (15)
35 Si	0.78 s	10.197	7 / 2−	β -		34.984 583 (41)
36 Si	0.45 s	7.857 (β - ), 4.393 (β - n)	0+	β - > 90, β - n <10		35.986 695 (77)
37 Si	90 ms	12.402 (β - ), 5.585 (β - n)	7 / 2−	β - = 83, β - n = 17		36.992 921 (89)
38 Si	> 1 μs	10.499 (β - ), 6.754 (β - n)	0+	β - =?, β - n =?		37.995 523 (75)
39 Si	47.5 ms	15.15 (β - ), 8.918 (β - n)	5 / 2−	β - =?, β - n =?		39.002 491 (97)
40 Si	33 ms	13.507 (β - ), 10.189 (β - n)	0+	β - =?, β - n =?		40.005 83 (25)
41 Si	20 ms	17.099 (β - ), 12.123 (β - n)		β - =?, β - n =?		41.013 01 (40)
42 Si	12.5 ms	15.556 (β - ), 13.47 (β - n)	0+	β - =?, β - n =?		42.017 78 (54 #)
43 Si	> 60 ns	18.425 (β - ), 14.024 (β - n)		β - =?, β - n =?		43.024 80 (64 #)
44 Si	> 360 ns	18.071 (β - ), 15.766 (β - n)	0+	β - =?, β - n =?		44.030 61 (64 #)
45 Si						45.039 95 (75 #)

₁₅ phosphorus

isotope	Half-life	Decay energy (MeV)	Spin / parity	Type (s) of decay (%)	NH (%)	Mass (u)
24 P		2.333	1+	p		24,035 77 (54 #)
25 p	<30 ns	1.705	1/2 +	p		25,021 19 (43 #)
26 P	43.7 ms	18.112 (ε), 12.6 (εp), 1.329 (β + 2p)	3+	ε = 61.04, εp = 36.8, β + 2p = 2.16		26,011 78 (21 #)
27 P.	260 ms	11.662 (β + ), 4.199 (β + p)	1/2 +	β + = 99.93, β + p = 0.07		26.999 224 (28)
28 P	270.3 ms	14.345 (ε), 2.76 (β + p), 4.361 (β + α)	3+	ε = 99.999, β + p = 1.3 · 10 −3 , β + α = 8.6 · 10 −4		27.992 3266 (12)
29 P	4.142 s	4,943	1/2 +	β +		28.981 800 79 (60)
30 p	2.498 min	4,232	1+	β +		29.978 313 75 (34)
31 P.	stable		1/2 +		100	30.973 761 998 42 (70)
32 P	14.262 d	1.711	1+	β -		31.973 907 643 (42)
33 P	25.35 d	0.249	1/2 +	β -		32.971 7257 (12)
34 P	12.43 s	5.383	1+	β -		33.973 645 89 (87)
35 P	47.3 s	3,989	1/2 +	β -		34.973 3141 (20)
36 P.	5.6 s	10,413	4−	β -		35.978 260 (14)
37 P	2.31 s	7.9	1/2 +	β -		36.979 607 (41)
38 P	0.64 s	12.192 (β - ), 4.156 (β - n)	4−	β - = 88, β - n = 12		37.984 252 (93)
39 P	0.28 s	10.333 (β - ), 5.96 (β - n)	1/2 +	β - = 74, β - n = 26		38.986 227 (98)
40 p	125 ms	14.762 (β - ), 7.015 (β - n)	2−	β - = 84.2, β - n = 15.8		39.991 33 (12)
41 P	100 ms	14.029 (β - ), 9.787 (β - n)	1/2 +	β - = 70, β - n = 30		40.994 654 (86)
42 P	48.5 ms	18.644 (β - ), 11.943 (β - n)		β - = 50, β - n = 50		42.001 08 (23)
43 P	36.5 ms	14,246	1/2 +	β - n		43.005 02 (40)
44 p	18.5 ms	19.646 (β - ), 14.566 (β - n)	3 / 2−	β - =?, β - n =?		44.011 21 (54 #)
45 P	> 200 ns	19.31		β -		45.016 45 (64 #)
46 p	> 200 ns	22.747		β -		46.024 46 (75 #)
47 P						47,031 39 (86 #)

₁₆ sulfur

isotope	Half-life	Decay energy (MeV)	Spin / parity	Type (s) of decay (%)	NH (%)	Mass (u)
26 p	79 ns	1.756	0+	2p		26,029 07 (64 #)
27 p	15.5 ms	17.751 (β + ), 16.88 (β + p), 11.366 (β + 2p)	5/2 +	β + = 96.6, β + p = 2.3, β + 2p = 1.1		27,018 28 (43 #)
28 p	125 ms	11.218 (β + ), 9.167 (β + p)	0+	β + = 79.3, β + p = 20.7		28.004 37 (17)
29 p	187 ms	13.796 (β + ), 11.047 (β + p)	5/2 +	β + = 53, β + p = 47		28,996 611 (54)
30 p	1.178 s	6,142	0+	β +		29.984 907 03 (40)
31 p	2.572 s	5,398	1/2 +	ε		30.979 557 01 (25)
32 p	stable		0+		094.99	31.972 071 1744 (14)
33 p	stable		3/2 +		000.75	32.971 458 9098 (15)
34 p	stable		0+		004.25	33.967 867 004 (47)
35 p	87.37 d	0.167	3/2 +	β -		34.969 032 310 (43)
36 p	stable		0+		000.01	35.967 080 71 (20)
37 p	5.05 min	4.865	7 / 2−	β -		36.971 125 51 (21)
38 p	170.3 min	2.937	0+	β -		37.971 1633 (77)
39 p	11.5 s	6.638	7 / 2−	β -		38.975 134 (54)
40 p	8.8 s	4.72	0+	β -		39.975 4826 (43)
41 p	1.99 s	8.298	7 / 2−	β -		40.979 5935 (44)
42 p	1.03 s	7.278 (β - )	0+	β -		41.981 0651 (30)
43 p	0.28 s	12.126 (β - ), 4.651 (β - n)	3 / 2−	β - = 60, β - n = 40		42.986 9076 (53)
43m1 p	480 ns	0.54929	7 / 2−	IT		42.987 497 29
44 p	100 ms	11.41 (β - ), 7.046 (β - n)	0+	β - = 82, β - n = 18		43.990 1188 (56)
45 p	68 ms	14.373 (β - ), 8.556 (β - n)		β - = 46, β - n = 54		44.995 72 (74)
46 p	50 ms	13,851	0+	β -		46,000 04 (54 #)
47 p	20 ms	17.503 (β - ), 13.148 (β - n)	3 / 2−	β - =?, β - n =?		47.007 95 (54 #)
48 p	> 200 ns	16.823	0+	β -		48.013 70 (64 #)
49 p	<200 ns	0.36802	3 / 2−	n		49.022 76 (72 #)

₁₇ chlorine

isotope	Half-life	Decay energy (MeV)	Spin / parity	Type (s) of decay (%)	NH (%)	Mass (u)
28 cl		3.12	1+	p		28.029 54 (64 #)
29 cl	<20 ns	2.408	3/2 +	p		29,014 78 (43 #)
30 cl	<30 ns	0.31109	3+	p		30.004 77 (21 #)
31 cl	150 ms	11.976 (ε), 5.845 (β + p)	3/2 +	ε = 99.3, β + p = 0.7		30.992 414 (54)
32 cl	298 ms	12.681 (ε), 3.817 (εp), 5.733 (β + α)	1+	ε = 99.92, εp = 0.3, β + α = 0.05		31.985 684 64 (60)
33 Cl	2.511 s	5,583	3/2 +	ε		32.977 451 99 (42)
34 cl	1.5264 s	5,492	0+	ε		33.973 762 485 (52)
34m1 Cl	32 min	5.639 (ε), 0.14749 (IT)	3+	ε = 55.4, IT = 44.6		33.973 920 82
35 cl	stable		3/2 +		075.76	34.968 852 682 (37)
36 cl	3.01 · 10 5 a	0.70952 (β - ), 1.142 (ε)	2+	β - = 98.1, ε = 1.9		35.968 306 809 (38)
37 Cl	stable		3/2 +		024.24	36.965 902 602 (55)
38 Cl	37.24 min	4.917	2−	β -		37.968 010 44 (11)
38m1 Cl	715 ms	0.671	5−	IT		37.968 731 31
39 Cl	55.6 min	3.422	3/2 +	β -		38.968 0082 (19)
40 cl	1.35 min	7.482	2−	β -		39.970 415 (34)
41 cl	38.4 s	5.761	1/2 +	β -		40.970 685 (74)
42 cl	6.8 s	9.505	2−	β -		41.973 25 (15)
43 Cl	3.13 s	7.688	1/2 +	β -		42.973 89 (10)
44 Cl	0.56 s	12.059 (β - ), 3.325 (β - n)	2−	β - = 92, β - n = 8		43.977 87 (20)
45 cl	413 ms	11.411 (β - ), 6.242 (β - n)	1/2 +	β - = 76, β - n = 24		44.980 29 (11)
46 Cl	232 ms	15.916 (β - ), 7.885 (β - n)	2−	β - = 40, β - n = 60		45.985 17 (17)
47 Cl	101 ms	15.113 (β - ), 11.562 (β - n)		β - > 97, β - n <3		46.989 16 (43 #)
48 cl	> 200 ns	18.378		β -		47.995 64 (54 #)
49 cl	> 170 ns	18.006		β -		49.001 23 (64 #)
50 cl	20 ms	21.35 (β - ), 17.219 (β - n)		β - =?, β - n =?		50.009 05 (64 #)
51 Cl	> 200 ns	20,344	3/2 +	β -		51.015 54 (75 #)

₁₈ argon

isotope	Half-life	Decay energy (MeV)	Spin / parity	Type (s) of decay (%)	NH (%)	Mass (u)
30 ares	20 ns	0.43311	0+	p		30.023 07 (54 #)
31 ares	14.4 ms	18.4 (ε), 18.3 (β + p), 13.7 (β + 2p), 10.9 (β + 3p), 9.6 (εα), 8.72 (εpα)	5/2 +	ε = 29.39, β + p = 63, β + 2p = 7.2, β + 3p = 0.001, εα = 0.03, εpα = 0.38		31.012 12 (22 #)
32 ares	100.5 ms	11.134 (ε), 9.553 (εp)	0+	ε = 57, εp = 43		31,997 6378 (19)
33 ares	173 ms	11.619 (ε), 9.342 (εp)	1/2 +	ε = 61.3, εp = 38.7		32.989 925 55 (43)
34 ares	844.5 ms	6,062	0+	ε		33.980 270 090 (83)
35 ares	1.7756 s	5.966	3/2 +	ε		34.975 257 59 (80)
36 ares	stable 2ε		0+		000.3336	35.967 545 105 (28)
37 ares	35.04 d	0.81387	3/2 +	ε		36.966 776 33 (22)
38 ares	stable		0+		000.0629	37.962 732 11 (21)
39 ares	269 ​​a	0.56496	7 / 2−	β -		38.964 3130 (54)
40 ares	stable		0+		099.6035	39.962 383 1237 (24)
41 ares	109.61 min	2,492	7 / 2−	β -		40.964 500 57 (37)
42 ares	32.9 a	0.59931	0+	β -		41.963 0457 (62)
43 ares	5.37 min	4,566	5 / 2−	β -		42.965 6361 (57)
44 ares	11.87 min	3.108	0+	β -		43.964 9238 (17)
45 ares	21.48 s	6.845	5 / 2−	β -		44.968 039 73 (55)
46 ares	8.4 s	5.683	0+	β -		45,968 083 (44)
47 ares	1.23 s	10.501 (β - ), 2.132 (β - n)	3 / 2−	β - > 99.8, β - n <0.2		46.972 935 (96)
48 ares	475 ms	9,845	0+	β -		47.975 91 (32 #)
49 ares	170 ms	12.752 (β - ), 7.353 (β - n)	3 / 2−	β - = 35, β - n = 65		48.981 90 (43 #)
50 ares	85 ms	12.808 (β - ), 8.62 (β - n)	0+	β - = 65, β - n = 35		49.986 13 (54 #)
51 ares	> 200 ns	16.648	5 / 2−	β -		50.993 70 (64 #)
52 ares	10 ms	15.575	0+	β -		51.998 96 (64 #)
53 ares	3 ms	18,472	5 / 2−	β -		53.007 29 (75 #)

₁₉ potassium

isotope	Half-life	Decay energy (MeV)	Spin / parity	Type (s) of decay (%)	NH (%)	Mass (u)
32 K		2.52		p		32.022 65 (54 #)
33 K	<25 ns	1.954	3/2 +	p		33.007 56 (21 #)
34 K	<25 ns	0.87506	1+	p		33.998 69 (32 #)
35 K	178 ms	11.875 (ε), 5.978 (εp)	3/2 +	ε = 99.63, εp = 0.37		34.988 005 41 (55)
36 K	342 ms	12.815 (ε), 4.308 (εp), 6.174 (εα)	2+	ε = 99.95, εp = 0.05, εα = 0.0034		35.981 302 01 (37)
37 K	1.226 s	6.148	3/2 +	ε		36.973 375 89 (10)
38 K	7.636 min	5.914	3+	ε		37.969 081 12 (21)
38m1 K	924.3 ms	6.045	0+	ε		37.969 221 92
38m2 K	22 µs	3.459	7+	IT		37.972 794 35
39 K	stable		3/2 +		093.2581	38.963 706 4864 (49)
40 K	1.248 x 10 9 a	1.311 (β - ), 1.504 (ε)	4−	β - = 89.28, ε = 10.72	000.0117	39.963 998 166 (60)
40m1 K	336 ns	1.644	0	IT		39.965 763 07
41 K	stable		3/2 +		006.7302	40.961 825 2579 (41)
42 K	12.321 h	3.525	2−	β -		41.962 402 31 (11)
43 K	22.3 h	1,833	3/2 +	β -		42.960 734 70 (44)
44 K	22.13 min	5.687	2−	β -		43.961 586 99 (45)
45 K	17.81 min	4.197	3/2 +	β -		44.960 691 49 (56)
46 K	105 s	7.725	2−	β -		45.961 981 59 (78)
47 K	17.5 s	6.632	1/2 +	β -		46.961 6616 (15)
48 K	6.8 s	11.94 (β - ), 1.988 (β - n)	2−	β - = 98.86, β - n = 1.14		47.965 341 19 (83)
49 K	1.26 s	11.688 (β - ), 6.542 (β - n)	3/2 +	β - = 14, β - n = 86		48.968 210 75 (86)
50 K	472 ms	13.861 (β - ), 7.501 (β - n)	2−	β - = 71, β - n = 29		49.972 3800 (83)
51 K	365 ms	13.822 (β - ), 9.002 (β - n)	3/2 +	β - = 53, β - n = 47		50.975 828 (14)
52 K	118 ms	17.72 (β - ), 11.724 (β - n)	2−	β - = 36, β - n = 64		51.982 24 (43 #)
53 K	30 ms	16.776 (β - ), 14.511 (β - n), 8.515 (β - 2n)	3/2 +	β - = 16, β - n = 67, β - 2n = 17		52.987 46 (54 #)
54 K	10 ms	19.776 (β - ), 15.384 (β - n)	2−	β - =?, β - n =?		53.994 63 (64 #)
55 K	3 ms	19.058 (β - ), 17.414 (β - n)	3/2 +	β - =?, β - n =?		55,000 76 (75 #)
56 K	> 620 ns	21.825		β -		56.008 51 (86 #)

₂₀ calcium

isotope	Half-life	Decay energy (MeV)	Spin / parity	Type (s) of decay (%)	NH (%)	Mass (u)
34 Approx	<35 ns	1.474	0+	p		34.014 87 (32 #)
35 approx	25.7 ms	15.877 (εp), 11.213 (ε2p)	3/2 +	εp = 95.9, ε2p = 4.1		35.005 14 (21 #)
36 approx	102 ms	10.966 (ε), 9.307 (εp)	0+	ε = 45.7, εp = 54.3		35.993 074 (43)
37 Approx	181.1 ms	11.664 (ε), 9.807 (εp)	3/2 +	ε = 18.9, εp = 82.1		36.985 897 85 (68)
38 Approx	440 ms	6.742	0+	ε		37.976 319 22 (21)
39 Approx	859.6 ms	6.525	3/2 +	ε		38.970 710 81 (64)
40 approx	stable 2ε	0.19351	0+	2ε	096.941	39.962 590 863 (22)
41 Approx	1.02 x 10 5 a	0.422	7 / 2−	ε		40.962 277 92 (15)
42 approx	stable		0+		000.647	41.958 617 83 (16)
43 Approx	stable		7 / 2−		000.135	42.958 766 44 (24)
44 Approx	stable		0+		002.086	43.955 481 56 (35)
45 approx	162.61 d	0.25902	7 / 2−	β -		44.956 186 35 (39)
46 Approx	stable 2β	0.98858	0+	2β	000.004	45.953 6890 (24)
47 Approx	4.536 d	1.992	7 / 2−	β -		46.954 5424 (24)
48 approx	> 5.8 · 10 22 a	0.27867 (β - ), 4.267 (2β)	0+	β - = 25, 2β = 75	000.187	47.952 522 76 (13)
49 Approx	8.718 min	5.261	3 / 2−	β -		48.955 662 74 (23)
50 approx	13.9 s	4,959	0+	β -		49.957 4992 (17)
51 Approx	10 s	6.89	3 / 2−	β -		50.960 989 (24)
52 Approx	4.6 s	5.903 (β - ), 0.89431 (β - n)	0+	β - = 98, β - n = 2		51.963 217 (64)
53 Approx	90 ms	9.65 (β - ), 3.638 (β - n)	3 / 2−	β - = 70, β - n = 30		52.969 45 (43 #)
54 Approx	86 ms	9.442	0+	β -		53.973 40 (54 #)
55 Approx	22 ms	11.625	5 / 2−	β -		54,980 30 (54 #)
56 Approx	11 ms	10.833 (β - ), 8.006 (β - n)	0+	β - =?, β - n =?		55.985 08 (64 #)
57 Approx	5 ms	13.833 (β - ), 9.786 (β - n)		β - =?, β - n =?		56.992 62 (64 #)
58 Approx	> 620 ns	12.957 (β - ), 10.717 (β - n)	0+	β - =?, β - n =?		57.997 94 (75 #)

swell

See also list of isotopes # web links