鋦有从233Cm到251Cm共19种同位素以及10种同核异构体，全部都有放射性。其中，247Cm最稳定，半衰期1560万年，是之后所有原子序更高的核素半衰期的至少一万倍。它是R-过程产生的。锔最稳定的同核异构体则是246mCm，半衰期1.12秒。
圖表
|-
| rowspan=2|233Cm
| rowspan=2 style="text-align:right" | 96
| rowspan=2 style="text-align:right" | 137
| rowspan=2|233.05077(8)
| rowspan=2|1# min
|
| 233Am
| rowspan=2|3/2+#
|-
|
| 229Pu
|-
| rowspan=2|234Cm
| rowspan=2 style="text-align:right" | 96
| rowspan=2 style="text-align:right" | 138
| rowspan=2|234.05016(2)
| rowspan=2|51(12) s
|
| 234Am
| rowspan=2|0+
|-
|
| 230Pu
|-
| rowspan=2|235Cm
| rowspan=2 style="text-align:right" | 96
| rowspan=2 style="text-align:right" | 139
| rowspan=2|235.05143(22)#
| rowspan=2|5# min
|
| 235Am
| rowspan=2|5/2+#
|-
|
| 231Pu
|-
| rowspan=2|236Cm
| rowspan=2 style="text-align:right" | 96
| rowspan=2 style="text-align:right" | 140
| rowspan=2|236.05141(22)#
| rowspan=2|10# min
|
| 236Am
| rowspan=2|0+
|-
|
| 232Pu
|-
| rowspan=2|237Cm
| rowspan=2 style="text-align:right" | 96
| rowspan=2 style="text-align:right" | 141
| rowspan=2|237.05290(22)#
| rowspan=2|20# min
|
| 237Am
| rowspan=2|5/2+#
|-
|
| 233Pu
|-
| rowspan=2|238Cm
| rowspan=2 style="text-align:right" | 96
| rowspan=2 style="text-align:right" | 142
| rowspan=2|238.05303(4)
| rowspan=2|2.4(1) h
| (90%)
| 238Am
| rowspan=2|0+
|-
| (10%)
| 234Pu
|-
| rowspan=2|239Cm
| rowspan=2 style="text-align:right" | 96
| rowspan=2 style="text-align:right" | 143
| rowspan=2|239.05496(11)#
| rowspan=2|~2.9 h
| (99.9%)
| 239Am
| rowspan=2|(7/2−)
|-
| (.1%)
| 235Pu
|-
| rowspan=3|240Cm
| rowspan=3 style="text-align:right" | 96
| rowspan=3 style="text-align:right" | 144
| rowspan=3|240.0555295(25)
| rowspan=3|27(1) d
| (99.5%)
| 236Pu
| rowspan=3|0+
|-
| (.5%)
| 240Am
|-
| (3.9×10−6%)
| (various)
|-
| rowspan=2|241Cm
| rowspan=2 style="text-align:right" | 96
| rowspan=2 style="text-align:right" | 145
| rowspan=2|241.0576530(23)
| rowspan=2|32.8(2) d
| (99%)
| 241Am
| rowspan=2|1/2+
|-
| (1%)
| 237Pu
|-
| rowspan="3" |242Cm
| rowspan="3" style="text-align:right" | 96
| rowspan="3" style="text-align:right" | 146
| rowspan="3" |242.0588358(20)
| rowspan="3" |162.8(2) d
|
| 238Pu
| rowspan="3" |0+
|-
| SF (6.33×10−6%)
| (various)
|-
| (10−14%)
| 208Pb
34Si
|-
| rowspan=3|243Cm
| rowspan=3 style="text-align:right" | 96
| rowspan=3 style="text-align:right" | 147
| rowspan=3|243.0613891(22)
| rowspan=3|29.1(1) y
| (99.71%)
| 239Pu
| rowspan=3|5/2+
|-
| (.29%)
| 243Am
|-
| SF (5.3×10−9%)
| (various)
|-
| style="text-indent:1em" | 243mCm
| colspan="3" style="text-indent:2em" | 87.4(1) keV
| 1.08(3) µs
|
|
| 1/2+
|-
| rowspan=2|244Cm
| (various)
| rowspan=3|0+
|-
| (11%)
| 246Pu
|-
| (9%)
| 250Bk
|-
| 251Cm
| style="text-align:right" | 96
| style="text-align:right" | 155
| 251.082285(24)
| 16.8(2) min
|
| 251Bk
| (1/2+)
|}
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).
- 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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