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)#
| 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
| 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
|
|-
| 39Ar
| style="text-align:right" | 18
| style="text-align:right" | 21
| 38.964313(5)
| 269(3) y
| β−
| 39K
| 7/2−
| 痕量
|
|-
|
| style="text-align:right" | 18
| style="text-align:right" | 22
| 39.9623831225(29)
| colspan=3 align=center|穩定
| 0+
| 0.996035(4)
|
|-
| 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 [https://web.archive.org/web/20080923134436/http://www.nndc.bnl.gov/amdc/index.html 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 [http://www.iupac.org/publications/pac/2003/7506/7506x0683.html Atomic weights of the elements. Review 2000 (IUPAC Technical Report)] . Pure Appl. Chem. Vol. 75, No. 6, pp. 683-800, (2003) and [http://www.iupac.org/news/archives/2005/atomic-weights_revised05.html 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. [http://amdc.in2p3.fr/web/nubase_en.html 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 [http://www.nndc.bnl.gov/nudat2/ 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.

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