half-life (t1/2)
20Ne
90.5%
21Ne
0.27%
stable
22Ne
9.25%
stable
Standard atomic weight Ar°(Ne)
Neon (10Ne) possesses three stable isotopes: 20
Ne
, 21
Ne
, and 22
Ne
. In addition, 17 radioactive isotopes have been discovered, ranging from 15
Ne
to34
Ne
, all short-lived. The longest-lived is 24
Ne
with a half-life of 3.38(2) min. All others are under a minute, most under a second. The least stable is 15
Ne
with a half-life of 770(300) ys (7.7(3.0)×10−22 s). See isotopes of carbon for notes about the measurement. Light radioactive neon isotopes usually decay to fluorineoroxygen, while heavier ones decay to sodium.
Isotopic mass (Da)[4]
[n 2][n 3]
Natural abundance (mole fraction)
Excitation energy
Normal proportion[1]
Range of variation
15
Ne
[5]
10
5
15.043170(70)
770(300) ys
[590(230) keV]
13
O
(3/2−)
16
Ne
10
6
16.025751(22)
> 5.7 zs
[< 80 keV]
2p
14
O
0+
17
Ne
[n 7]
10
7
17.0177140(4)
109.2(6) ms
β+p (94.4(2.9)%)
16
O
1/2−
β+α (3.51(1)%)
13
N
β+ (2.1(2.9)%)
17
F
β+pα (0.014(4)%)
12
C
18
Ne
10
8
18.0057087(4)
1664.20(47) ms
β+
18
F
0+
19
Ne
10
9
19.00188091(17)
17.2569(19) s
β+
19
F
1/2+
20
Ne
10
10
19.9924401753(16)
Stable
0+
0.9048(3)
[0.8847, 0.9051][6]
21
Ne
10
11
20.99384669(4)
Stable
3/2+
0.0027(1)
[0.0027, 0.0171][6]
22
Ne
10
12
21.991385114(19)
Stable
0+
0.0925(3)
[0.0920, 0.0996][6]
23
Ne
10
13
22.99446691(11)
37.15(3) s
β−
23
Na
5/2+
24
Ne
10
14
23.9936106(6)
3.38(2) min
β−
24m
Na
0+
25
Ne
10
15
24.997810(30)
602(8) ms
β−
25
Na
1/2+
26
Ne
10
16
26.000516(20)
197(2) ms
β− (99.87(3)%)
26
Na
0+
β−n (0.13(3)%)
25
Na
27
Ne
10
17
27.007570(100)
30.9(1.1) ms
β− (98.0(5)%)
27
Na
(3/2+)
β−n (2.0(5)%)
26
Na
β−2n ?[n 8]
25
Na
?
28
Ne
10
18
28.012130(140)
18.8(2) ms
β− (84.3(1.1)%)
28
Na
0+
β−n (12(1)%)
27
Na
β−2n (3.7(5)%)
26
Na
29
Ne
10
19
29.019750(160)
14.7(4) ms
β− (68.0(5.1)%)
29
Na
(3/2−)
β−n (28(5)%)
28
Na
β−2n (4(1)%)
27
Na
30
Ne
10
20
30.024990(270)
7.22(18) ms
β− (78.1(4.6)%)
30
Na
0+
β−n (13(4)%)
29
Na
β−2n (8.9(2.3)%)
28
Na
31
Ne
10
21
31.033470(290)
3.4(8) ms
β−
31
Na
(3/2−)
β−n ?[n 8]
30
Na
?
β−2n ?[n 8]
29
Na
?
32
Ne
10
22
32.039720(540)#
3.5(9) ms
β−
32
Na
0+
β−n ?[n 8]
31
Na
?
β−2n ?[n 8]
30
Na
?
33
Ne
?[n 9]
10
23
33.049520(640)#
< 260 ns
n ?[n 8]
32
Ne
7/2−#
34
Ne
10
24
34.056730(550)#
2 ms# [> 1.5 μs]
β− ?[n 8]
34
Na
0+
β−2n ?[n 8]
32
Ne
?
β−n ?[n 8]
33
Ne
?
p:
Hydrogen and
alkali metals
Alkaline
earth metals
Pnictogens
Chalcogens
Halogens
Noble gases
12 3 4
5 6 7 8 9 10 11 12
13 14 15 16 17 18 19 20
21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38
39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56
