氪（原子量：83.798(2)）共有40個同位素，其中有5個同位素是穩定的。
圖表
|-
| 69Kr
| style="text-align:right" | 36
| style="text-align:right" | 33
| 68.96518(43)#
| 32(10) ms
|
| 69Br
| 5/2-#
|
|
|-
| 70Kr
| style="text-align:right" | 36
| style="text-align:right" | 34
| 69.95526(41)#
| 52(17) ms
|
| 70Br
| 0+
|
|
|-
| rowspan=2|71Kr
| rowspan=2 style="text-align:right" | 36
| rowspan=2 style="text-align:right" | 35
| rowspan=2|70.94963(70)
| rowspan=2|100(3) ms
| (94.8%)
| 71Br
| rowspan=2|(5/2)-
| rowspan=2|
| rowspan=2|
|-
| , (5.2%)
| 70Se
|-
| 72Kr
| style="text-align:right" | 36
| style="text-align:right" | 36
| 71.942092(9)
| 17.16(18) s
|
| 72Br
| 0+
|
|
|-
| rowspan=2|73Kr
| rowspan=2 style="text-align:right" | 36
| rowspan=2 style="text-align:right" | 37
| rowspan=2|72.939289(7)
| rowspan=2|28.6(6) s
| (99.32%)
| 73Br
| rowspan=2|3/2-
| rowspan=2|
| rowspan=2|
|-
| , p (.68%)
| 72Se
|-
| style="text-indent:1em" | 73mKr
| colspan="3" style="text-indent:2em" | 433.66(12) keV
| 107(10) ns
|
|
| (9/2+)
|
|
|-
| 74Kr
| style="text-align:right" | 36
| style="text-align:right" | 38
| 73.9330844(22)
| 11.50(11) min
|
| 74Br
| 0+
|
|
|-
| 75Kr
| style="text-align:right" | 36
| style="text-align:right" | 39
| 74.930946(9)
| 4.29(17) min
|
| 75Br
| 5/2+
|
|
|-
| 76Kr
| style="text-align:right" | 36
| style="text-align:right" | 40
| 75.925910(4)
| 14.8(1) h
|
| 76Br
| 0+
|
|
|-
| 77Kr
| style="text-align:right" | 36
| style="text-align:right" | 41
| 76.9246700(21)
| 74.4(6) min
|
| 77Br
| 5/2+
|
|
|-
| 78Kr
| style="text-align:right" | 36
| style="text-align:right" | 42
| 77.9203648(12)
| align=center|9.2 y
| style="text-align:right" | 36
| style="text-align:right" | 45
| 80.9165920(21)
| 2.29(11)×105 a
|
| 81Br
| 7/2+
|trace
|
|-
| rowspan=2 style="text-indent:1em" | 81mKr
| rowspan=2 colspan="3" style="text-indent:2em" | 190.62(4) keV
| rowspan=2|13.10(3) s
| IT (99.975%)
| 81Kr
| rowspan=2|1/2-
| rowspan=2|
| rowspan=2|
|-
| (.025%)
| 81Br
|-
| 82Kr
| style="text-align:right" | 36
| style="text-align:right" | 46
| 81.9134836(19)
| colspan=3 align=center|**'
| 0+
| 0.11593(31)
|
|-
| 83Kr
| style="text-align:right" | 36
| style="text-align:right" | 47
| 82.914136(3)
| colspan=3 align=center|**'
| 9/2+
| 0.11500(19)
|
|-
| style="text-indent:1em" | 83m1Kr
| colspan="3" style="text-indent:2em" | 9.4053(8) keV
| 154.4(11) ns
|
|
| 7/2+
|
|
|-
| style="text-indent:1em" | 83m2Kr
| colspan="3" style="text-indent:2em" | 41.5569(10) keV
| 1.83(2) h
| IT
| 83Kr
| 1/2-
|
|
|-
|
| 0+
| 0.17279(41)
|
|-
| 87Kr
| style="text-align:right" | 36
| style="text-align:right" | 51
| 86.91335486(29)
| 76.3(5) min
|
| 87Rb
| 5/2+
|
|
|-
| 88Kr
| style="text-align:right" | 36
| style="text-align:right" | 52
| 87.914447(14)
| 2.84(3) h
|
| 88Rb
| 0+
|
|
|-
| 89Kr
| style="text-align:right" | 36
| style="text-align:right" | 53
| 88.91763(6)
| 3.15(4) min
|
| 89Rb
| 3/2(+#)
|
|
|-
| 90Kr
| style="text-align:right" | 36
| style="text-align:right" | 54
| 89.919517(20)
| 32.32(9) s
|
| 90mRb
| 0+
|
|
|-
| 91Kr
| style="text-align:right" | 36
| style="text-align:right" | 55
| 90.92345(6)
| 8.57(4) s
|
| 91Rb
| 5/2(+)
|
|
|-
| rowspan=2|92Kr
| rowspan=2 style="text-align:right" | 36
| rowspan=2 style="text-align:right" | 56
| rowspan=2|91.926156(13)
| rowspan=2|1.840(8) s
| (99.96%)
| 92Rb
| rowspan=2|0+
| rowspan=2|
| rowspan=2|
|-
| , (.033%)
| 91Rb
|-
| rowspan=2|93Kr
| rowspan=2 style="text-align:right" | 36
| rowspan=2 style="text-align:right" | 57
| rowspan=2|92.93127(11)
| rowspan=2|1.286(10) s
| (98.05%)
| 93Rb
| rowspan=2|1/2+
| rowspan=2|
| rowspan=2|
|-
| , (1.95%)
| 92Rb
|-
| rowspan=2|94Kr
| rowspan=2 style="text-align:right" | 36
| rowspan=2 style="text-align:right" | 58
| rowspan=2|93.93436(32)#
| rowspan=2|210(4) ms
| (94.3%)
| 94Rb
| rowspan=2|0+
| rowspan=2|
| rowspan=2|
|-
| , (5.7%)
| 93Rb
|-
| 95Kr
| style="text-align:right" | 36
| style="text-align:right" | 59
| 94.93984(43)#
| 114(3) ms
|
| 95Rb
| 1/2(+)
|
|
|-
| 96Kr
| style="text-align:right" | 36
| style="text-align:right" | 60
| 95.94307(54)#
| 80(7) ms
|
| 96Rb
| 0+
|
|
|-
| rowspan=2|97Kr
| rowspan=2 style="text-align:right" | 36
| rowspan=2 style="text-align:right" | 61
| rowspan=2|96.94856(54)#
| rowspan=2|63(4) ms
|
| 97Rb
| rowspan=2|3/2+#
| rowspan=2|
| rowspan=2|
|-
| , n
| 96Rb
|-
| 98Kr
| style="text-align:right" | 36
| style="text-align:right" | 62
| 97.95191(64)#
| 46(8) ms
|
|
| 0+
|
|
|-
| 99Kr
| style="text-align:right" | 36
| style="text-align:right" | 63
| 98.95760(64)#
| 40(11) ms
|
|
| (3/2+)#
|
|
|-
| 100Kr
| style="text-align:right" | 36
| style="text-align:right" | 64
| 99.96114(54)#
| 10# ms
[>300 ns]
|
|
| 0+
|
|
|-
| rowspan=3 | 101Kr
| rowspan=3 style="text-align:right"| 36
| rowspan=3 style="text-align:right"| 65
| rowspan=3 | unknown
| rowspan=3 | >635 ns
| , 2
| 99Rb
| rowspan=3 | unknown
| rowspan=3 |
| rowspan=3 |
|-
| ,
| 100Rb
|-
|
| 101Rb
|}
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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