nuclide
symbol
Z(p) N(n)  
isotopic mass (u)
 
half-life nuclear
spin
representative
isotopic
composition
(mole fraction)
range of natural
variation
(mole fraction)
excitation energy
Helium-3 2 1 3.0160293191(26) Stable 1/2+ 0.00000134(3) 4.6×10−10-0.000041
Helium-4 2 2 4.00260325415(6) Stable 0+ 0.99999866(3) 0.999959-1
Helium-5 2 3 5.01222(5) 700(30)×10−24 s [0.60(2) MeV] 3/2-
Highly unstable, decays to Helium 4.
Helium 6 2 4 6.0188891(8) 806.7(15) ms 0+
Produced from Helium 7 or Lithium 11, decomposes to Lithium 6 through beta decay (beta-minus).
Helium 7 2 5 7.028021(18) 2.9(5)×10−21 s [159(28) keV] (3/2)-
Highly unstable, decays to Helium|6.
Helium|8 2 6 8.033922(7) 119.0(15) ms 0+
Produced from Helium|9, decomposes to Lithium|7 through beta decay then emits a delayed neutron.
Helium|9 2 7 9.04395(3) 7(4)×10−21 s [100(60) keV] 1/2(-#)
Highly unstable, decays to Helium|8.
Helium|10 2 8 10.05240(8) 2.7(18)×10−21 s [0.17(11) MeV] 0+
Highly unstable, decays to Helium|9.
Lithium 4 3 1 4.02719(23) 91(9)×10−24 s [6.03 MeV] 2-
Lithium 5 3 2 5.01254(5) 370(30)×10−24 s [~1.5 MeV] 3/2-
Lithium 6 3 3 6.015122795(16) Stable 1+ [0.0759(4)] 0.07714-0.07225
Lithium 7 3 4 7.01600455(8) Stable 3/2- [0.9241(4)] 0.92275-0.92786
Lithium 8 3 5 8.02248736(10) 840.3(9) ms 2+
Lithium 9 3 6 9.0267895(21) 178.3(4) ms 3/2-
Lithium 10 3 7 10.035481(16) 2.0(5)×10−21 s [1.2(3) MeV] (1-,2-)
Lithium|10m1 200(40) keV 3.7(15)×10−21 s 1+
Lithium|10m2 480(40) keV 1.35(24)×10−21 s 2+
Lithium 11 3 8 11.043798(21) 8.75(14) ms 3/2-
Lithium 12 3 9 12.05378(107)# <10 ns
5Be 4 1 5.04079(429)# (1/2+)#
6Be 4 2 6.019726(6) 5.0(3)×10−21 s [0.092(6) MeV] 0+
7Be 4 3 7.01692983(11) 53.22(6) d 3/2-
8Be 4 4 8.00530510(4) 6.7(17)×10−17 s [6.8(17) eV] 0+
9Be 4 5 9.0121822(4) Stable 3/2- 1.0000
10Be 4 6 10.0135338(4) 1.39×106 a 0+ Trace
11Be 4 7 11.021658(7) 13.81(8) s 1/2+
12Be 4 8 12.026921(16) 21.49(3) ms 0+
13Be 4 9 13.03569(8) .5(1) ns 1/2+
14Be 4 10 14.04289(14) 4.84(10) ms 0+
15Be 4 11 15.05346(54)# <200 ns
16Be 4 12 16.06192(54)# <200 ns 0+
6B 5 1 6.04681(75)#
7B 5 2 7.02992(8) 350(50)E-24 s [1.4(2) MeV] (3/2-)
8B 5 3 8.0246072(11) 770(3) ms 2+
9B 5 4 9.0133288(11) 800(300)E-21 s [0.54(21) keV] 3/2-
10B 5 5 10.0129370(4) Stable 3+ 0.199(7) 0.18929-0.20386
11B 5 6 11.0093054(4) Stable 3/2- 0.801(7) 0.79614-0.81071
12B 5 7 12.0143521(15) 20.20(2) ms 1+
13B 5 8 13.0177802(12) 17.33(17) ms 3/2-
14B 5 9 14.025404(23) 12.5(5) ms 2-
15B 5 10 15.031103(24) 9.87(7) ms 3/2-
16B 5 11 16.03981(6) <190E-12 s [<0.1 MeV] 0-
17B 5 12 17.04699(18) 5.08(5) ms (3/2-)
18B 5 13 18.05617(86)# <26 ns (4-)#
19B 5 14 19.06373(43)# 2.92(13) ms (3/2-)#
8C 6 2 8.037675(25) 2.0(4) x 10−21 s [230(50) keV] 0+
9C 6 3 9.0310367(23) 126.5(9) ms (3/2-)
10C 6 4 10.0168532(4) 19.290(12) s 0+
11C 6 5 11.0114336(10) 20.334(24) min 3/2-
12C 6 6 12 by definition Stable 0+ 0.9893(8) 0.98853-0.99037
13C 6 7 13.0033548378(10) Stable 1/2- 0.0107(8) 0.00963-0.01147
14C 6 8 14.003241989(4) 5.70(3) x 103 years 0+ <10−12
15C 6 9 15.0105993(9) 2.449(5) s 1/2+
16C 6 10 16.014701(4) 0.747(8) s 0+
17C 6 11 17.022586(19) 193(5) ms (3/2+)
18C 6 12 18.02676(3) 92(2) ms 0+
19C 6 13 19.03481(11) 46.2(23) ms (1/2+)
20C 6 14 20.04032(26) 16(3) ms [14(+6-5) ms] 0+
21C 6 15 21.04934(54)# <30 ns (1/2+)#
22C 6 16 22.05720(97)# 6.2(13) ms [6.1(+14-12) ms] 0+
10N 7 3 10.04165(43) 200(140)× 10−24 s [2.3(16) MeV] (2−)
11N 7 4 11.02609(5) 590(210)× 10−24 s [1.58(+75−52) MeV] 1/2+
11mN 740(60) keV 6.90(80)× 10−22 s 1/2−
12N 7 5 12.0186132(11) 11.000(16) ms 1+
13N 7 6 13.00573861(29) 9.965(4) min 1/2−
14N 7 7 14.0030740048(6) Stable 1+ 0.99636(20) 0.99579–0.99654
15N 7 8 15.0001088982(7) Stable 1/2− 0.00364(20) 0.00346–0.00421
16N 7 9 16.0061017(28) 7.13(2) s 2−
17N 7 10 17.008450(16) 4.173(4) s 1/2−
18N 7 11 18.014079(20) 622(9) ms 1−
19N 7 12 19.017029(18) 271(8) ms (1/2−)
20N 7 13 20.02337(6) 130(7) ms
21N 7 14 21.02711(10) 87(6) ms 1/2−#
22N 7 15 22.03439(21) 13.9(14) ms
23N 7 16 23.04122(32)# 14.5(24) ms [14.1(+12−15) ms] 1/2−#
24N 7 17 24.05104(43)# <52 ns
25N 7 18 25.06066(54)# <260 ns 1/2−#
12O 8 4 12.034405(20) 580(30)E-24 s [0.40(25) MeV] 0+
13O 8 5 13.024812(10) 8.58(5) ms (3/2-)
14O 8 6 14.00859625(12) 70.598(18) s 0+
15O 8 7 15.0030656(5) 122.24(16) s 1/2-
16O 8 8 15.99491461956(16) Stable 0+ 0.99757(16) 0.99738-0.99776
17O 8 9 16.99913170(12) Stable 5/2+ 0.00038(1) 0.00037-0.00040
18O 8 10 17.9991610(7) Stable 0+ 0.00205(14) 0.00188-0.00222
19O 8 11 19.003580(3) 26.464(9) s 5/2+
20O 8 12 20.0040767(12) 13.51(5) s 0+
21O 8 13 21.008656(13) 3.42(10) s (1/2,3/2,5/2)+
22O 8 14 22.00997(6) 2.25(15) s 0+
23O 8 15 23.01569(13) 82(37) ms 1/2+#
24O 8 16 24.02047(25) 65(5) ms 0+
14F 9 5 14.03506(43)# 2-#
15F 9 6 15.01801(14) 410(60)E-24 s [1.0(2) MeV] (1/2+)
16F 9 7 16.011466(9) 11(6)E-21 s [40(20) keV] 0-
17F 9 8 17.00209524(27) 64.49(16) s 5/2+
18F 9 9 18.0009380(6) 109.771(20) min 1+
18mF 1121.36(15) keV 162(7) ns 5+
19F 9 10 18.99840322(7) Stable 1/2+ 1.0000
20F 9 11 19.99998132(8) 11.163(8) s 2+
21F 9 12 20.9999490(19) 4.158(20) s 5/2+
22F 9 13 22.002999(13) 4.23(4) s 4+,(3+)
23F 9 14 23.00357(9) 2.23(14) s (3/2,5/2)+
24F 9 15 24.00812(8) 400(50) ms (1,2,3)+
25F 9 16 25.01210(11) 50(6) ms (5/2+)#
26F 9 17 26.01962(18) 9.6(8) ms 1+
27F 9 18 27.02676(40) 4.9(2) ms 5/2+#
28F 9 19 28.03567(55)# <40 ns
29F 9 20 29.04326(62)# 2.6(3) ms 5/2+#
30F 9 21 30.05250(64)# <260 ns
31F 9 22 31.06043(64)# 1# ms [>260 ns] 5/2+#
16Ne 10 6 16.025761(22) 9E-21 s [122(37) keV] 0+
17Ne 10 7 17.017672(29) 109.2(6) ms 1/2-
18Ne 10 8 18.0057082(3) 1.672(8) s 0+
Evidence exists that the mode of decay is by emission of a diproton.
19Ne 10 9 19.0018802(3) 17.296(5) s 1/2+
20Ne 10 10 19.9924401754(19) Stable 0+ 0.9048(3) 0.8847-0.9051
21Ne 10 11 20.99384668(4) Stable 3/2+ 0.0027(1) 0.0027-0.0171
22Ne 10 12 21.991385114(19) Stable 0+ 0.0925(3) 0.0920-0.0996
23Ne 10 13 22.99446690(11) 37.24(12) s 5/2+
24Ne 10 14 23.9936108(4) 3.38(2) min 0+
25Ne 10 15 24.997737(28) 602(8) ms (3/2)+
26Ne 10 16 26.000461(29) 197(1) ms 0+
27Ne 10 17 27.00759(12) 32(2) ms (3/2+)#
28Ne 10 18 28.01207(16) 18.3(22) ms 0+
29Ne 10 19 29.01939(29) 15.6(5) ms (3/2+)#
30Ne 10 20 30.02480(61) 5.8(2) ms 0+
31Ne 10 21 31.03311(97)# 3.4(8) ms 7/2-#
32Ne 10 22 32.04002(86)# 3.5(9) ms 0+
33Ne 10 23 33.04938(86)# <260 ns 7/2-#
34Ne 10 24 34.05703(87)# 1# ms [>1.5 µs] 0+
18Na 11 7 18.02597(5) 1.3(4)E-21 s (1-)#
19Na 11 8 19.013877(13) <40 ns (5/2+)#
20Na 11 9 20.007351(7) 447.9(23) ms 2+
21Na 11 10 20.9976552(8) 22.49(4) s 3/2+
22Na 11 11 21.9944364(4) 2.6027(10) yr 3+
22mNa 583.03(9) keV 244(6) ns 1+
23Na 11 12 22.9897692809(29) Stable 3/2+ 1.0000
24Na 11 13 23.99096278(8) 14.9590(12) h 4+
24mNa 472.207(9) keV 20.20(7) ms 1+
25Na 11 14 24.9899540(13) 59.1(6) s 5/2+
26Na 11 15 25.992633(6) 1.077(5) s 3+
27Na 11 16 26.994077(4) 301(6) ms 5/2+
28Na 11 17 27.998938(14) 30.5(4) ms 1+
29Na 11 18 29.002861(14) 44.9(12) ms 3/2(+#)
30Na 11 19 30.008976(27) 48.4(17) ms 2+
31Na 11 20 31.01359(23) 17.0(4) ms (3/2+)
32Na 11 21 32.02047(38) 12.9(7) ms (3-,4-)
33Na 11 22 33.02672(94) 8.2(2) ms 3/2+#
34Na 11 23 34.03517(96)# 5.5(10) ms 1+
35Na 11 24 35.04249(102)# 1.5(5) ms 3/2+#
36Na 11 25 36.05148(102)# <260 ns
37Na 11 26 37.05934(103)# 1# ms [>1.5 µs] 3/2+#
19Mg 12 7 19.03547(27) 1/2-#
20Mg 12 8 20.018863(29) 90.8(24) ms 0+
21Mg 12 9 21.011713(18) 122(2) ms (5/2,3/2)+
22Mg 12 10 21.9995738(14) 3.8755(12) s 0+
23Mg 12 11 22.9941237(14) 11.317(11) s 3/2+
24Mg 12 12 23.985041700(14) Stable 0+ 0.7899(4) 0.78958-0.79017
25Mg 12 13 24.98583692(3) Stable 5/2+ 0.1000(1) 0.09996-0.10012
26Mg 12 14 25.982592929(30) Stable 0+ 0.1101(3) 0.10987-0.11030
27Mg 12 15 26.98434059(5) 9.458(12) min 1/2+
28Mg 12 16 27.9838768(22) 20.915(9) h 0+
29Mg 12 17 28.988600(15) 1.30(12) s 3/2+
30Mg 12 18 29.990434(9) 335(17) ms 0+
31Mg 12 19 30.996546(13) 230(20) ms 3/2+
32Mg 12 20 31.998975(19) 86(5) ms 0+
33Mg 12 21 33.005254(21) 90.5(16) ms 7/2-#
34Mg 12 22 34.00946(25) 20(10) ms 0+
35Mg 12 23 35.01734(43)# 70(40) ms (7/2-)#
36Mg 12 24 36.02300(54)# 3.9(13) ms 0+
37Mg 12 25 37.03140(97)# 40# ms [>260 ns] 7/2-#
38Mg 12 26 38.03757(54)# 1# ms [>260 ns] 0+
39Mg 12 27 39.04677(55)# <260 ns 7/2-#
40Mg 12 28 40.05393(97)# 1# ms 0+