氬的同位素

氬（原子量：39.948(1)）共有25個同位素，其中有3個是穩定的。

 圖表 

|-
| 29Ar
| style="text-align:right" | 18
| style="text-align:right" | 11
| 29.04076(47)#
|
| 2
| 27S
| 5/2+#
|
|
|-
| 30Ar
| style="text-align:right" | 18
| style="text-align:right" | 12
| 30.02156(32)#
| <20 ns
| 
| 29Cl
| 0+
|
|
|-
| rowspan=4|31Ar
| rowspan=4 style="text-align:right" | 18
| rowspan=4 style="text-align:right" | 13
| rowspan=4|31.01212(22)#
| rowspan=4|14.4(6) ms
| β+, p (55.0%)
| 30S
| rowspan=4|5/2(+#)
| rowspan=4|
| rowspan=4|
|-
| β+ (40.4%)
| 31Cl
|-
| β+, 2p (2.48%)
| 29P
|-
| β+, 3p (2.1%)
| 28Si
|-
| rowspan=2|32Ar
| rowspan=2 style="text-align:right" | 18
| rowspan=2 style="text-align:right" | 14
| rowspan=2|31.9976380(19)
| rowspan=2|98(2) ms
| β+ (56.99%)
| 32Cl
| rowspan=2|0+
| rowspan=2|
| rowspan=2|
|-
| β+, p (43.01%)
| 31S
|-
| rowspan=2|33Ar
| rowspan=2 style="text-align:right" | 18
| rowspan=2 style="text-align:right" | 15
| rowspan=2|32.9899257(5)
| rowspan=2|173.0(20) ms
| β+ (61.35%)
| 33Cl
| rowspan=2|1/2+
| rowspan=2|
| rowspan=2|
|-
| β+, p (38.65%)
| 32S
|-
| 34Ar
| style="text-align:right" | 18
| style="text-align:right" | 16
| 33.9802712(4)
| 844.5(34) ms
| β+
| 34Cl
| 0+
|
|
|-
| 35Ar
| style="text-align:right" | 18
| style="text-align:right" | 17
| 34.9752576(8)
| 1.775(4) s
| β+
| 35Cl
| 3/2+
|
|
|-
| 36Ar
| style="text-align:right" | 18
| style="text-align:right" | 18
| 35.967545106(29)
| colspan=3 align=center|觀測上穩定Believed to undergo double electron capture to 36S (lightest theoretically unstable nuclide for which no evidence of radioactivity has been observed)
| 0+
| 0.003336(4)
|
|-
| 37Ar
| style="text-align:right" | 18
| style="text-align:right" | 19
| 36.96677632(22)
| 35.04(4) d
| ε
| 37Cl
| 3/2+
|
|
|-
| 38Ar
| style="text-align:right" | 18
| style="text-align:right" | 20
| 37.9627324(4)
| colspan=3 align=center|
| 0+
| 6.29(1)×10−4
|
|-
| 39ArUsed in 
| style="text-align:right" | 18
| style="text-align:right" | 21
| 38.964313(5)
| 269(3) y
| β−
| 39K
| 7/2−
| 痕量
|
|-
| 用于和鉀－氬年代測定法中
| style="text-align:right" | 18
| style="text-align:right" | 22
| 39.9623831225(29)
| colspan=3 align=center|穩定
| 0+
| 0.996035(4)Generated from 40K in rocks. These ratios are terrestrial. Cosmic abundance is far less than 36Ar.
|
|-
| 41Ar
| style="text-align:right" | 18
| style="text-align:right" | 23
| 40.9645006(4)
| 109.61(4) min
| β−
| 41K
| 7/2−
|痕量
|
|-
| 42Ar
| style="text-align:right" | 18
| style="text-align:right" | 24
| 41.963046(6)
| 32.9(11) y
| β−
| 42K
| 0+
| 
|
|-
| 43Ar
| style="text-align:right" | 18
| style="text-align:right" | 25
| 42.965636(6)
| 5.37(6) min
| β−
| 43K
| (5/2−)
|
|
|-
| 44Ar
| style="text-align:right" | 18
| style="text-align:right" | 26
| 43.9649240(17)
| 11.87(5) min
| β−
| 44K
| 0+
|
|
|-
| 45Ar
| style="text-align:right" | 18
| style="text-align:right" | 27
| 44.9680400(6)
| 21.48(15) s
| β−
| 45K
| (1/2,3/2,5/2)−
|
|
|-
| 46Ar
| style="text-align:right" | 18
| style="text-align:right" | 28
| 45.96809(4)
| 8.4(6) s
| β−
| 46K
| 0+
|
|
|-
| rowspan=2|47Ar
| rowspan=2 style="text-align:right" | 18
| rowspan=2 style="text-align:right" | 29
| rowspan=2|46.97219(11)
| rowspan=2|1.23(3) s
| β− (99%)
| 47K
| rowspan=2|3/2−#
| rowspan=2|
| rowspan=2|
|-
| β−, n (1%)
| 46K
|-
| 48Ar
| style="text-align:right" | 18
| style="text-align:right" | 30
| 47.97454(32)#
| 0.48(40) s
| β−
| 48K
| 0+
|
|
|-
| 49Ar
| style="text-align:right" | 18
| style="text-align:right" | 31
| 48.98052(54)#
| 170(50) ms
| β−
| 49K
| 3/2−#
|
|
|-
| 50Ar
| style="text-align:right" | 18
| style="text-align:right" | 32
| 49.98443(75)#
| 85(30) ms
| β−
| 50K
| 0+
|
|
|-
| 51Ar
| style="text-align:right" | 18
| style="text-align:right" | 33
| 50.99163(75)#
| 60# ms [>200 ns]
| β−
| 51K
| 3/2−#
|
|
|-
| 52Ar
| style="text-align:right" | 18
| style="text-align:right" | 34
| 51.99678(97)#
| 10# ms
| β−
| 52K
| 0+
|
|
|-
| rowspan=2|53Ar
| rowspan=2 style="text-align:right" | 18
| rowspan=2 style="text-align:right" | 35
| rowspan=2|53.00494(107)#
| rowspan=2|3# ms
| β−
| 53K
| rowspan=2|(5/2−)#
| rowspan=2|
| rowspan=2|
|-
| β−, n
| 52K
|}

参考文獻

 Isotope masses from Ame2003 Atomic Mass Evaluation by G. Audi, A.H. Wapstra, C. Thibault, J. Blachot and O. Bersillon in Nuclear Physics A729 (2003).
 Isotopic compositions and standard atomic masses from Atomic weights of the elements. Review 2000 (IUPAC Technical Report) . Pure Appl. Chem. Vol. 75, No. 6, pp. 683-800, (2003) and Atomic Weights Revised (2005) .
 Half-life, spin, and isomer data selected from these sources. Editing notes on this article's talk page.
 Audi, Bersillon, Blachot, Wapstra. The Nubase2003 evaluation of nuclear and decay properties , Nuc. Phys. A 729, pp. 3-128 (2003).
 National Nuclear Data Center, Brookhaven National Laboratory. Information extracted from the NuDat 2.1 database  (retrieved Sept. 2005).
 David R. Lide (ed.), Norman E. Holden in CRC Handbook of Chemistry and Physics, 85th Edition, online version. CRC Press. Boca Raton, Florida (2005). Section 11, Table of the Isotopes.

Ar
Category:氩