錼只痕量存在于自然界，通常由人工合成制得，因此无法确定。镎有从219Np至244Np（不包括221Np）共25种同位素，没有一个是稳定的。最长寿的放射性同位素是237Np，半衰期214.4万年。
圖表
|-
|
| style="text-align:right" | 93
| style="text-align:right" | 132
| 225.03391(8)
| 3# ms [>2 µs]
|
| 221Pa
| 9/2−#
|
|-
|
| style="text-align:right" | 93
| style="text-align:right" | 133
| 226.03515(10)#
| 35(10) ms
|
| 222Pa
|
|
|-
| rowspan=2|
| rowspan=2 style="text-align:right" | 93
| rowspan=2 style="text-align:right" | 134
| rowspan=2|227.03496(8)
| rowspan=2|510(60) ms
| (99.95%)
| 223Pa
| rowspan=2|5/2−#
| rowspan="2" |
|-
| (.05%)
| 227U
|-
| rowspan=3|
| rowspan=3 style="text-align:right" | 93
| rowspan=3 style="text-align:right" | 135
| rowspan=3|228.03618(21)#
| rowspan=3|61.4(14) s
| (59%)
| 228U
| rowspan=3|
| rowspan="3" |
|-
| (41%)
| 224Pa
|-
| , SF (.012%)
| (various)
|-
| rowspan=2|
| rowspan=2 style="text-align:right" | 93
| rowspan=2 style="text-align:right" | 136
| rowspan=2|229.03626(9)
| rowspan=2|4.0(2) min
| (51%)
| 225Pa
| rowspan=2|5/2+#
| rowspan="2" |
|-
| (49%)
| 229U
|-
| rowspan=2|
| rowspan=2 style="text-align:right" | 93
| rowspan=2 style="text-align:right" | 137
| rowspan=2|230.03783(6)
| rowspan=2|4.6(3) min
| (97%)
| 230U
| rowspan=2|
| rowspan="2" |
|-
| (3%)
| 226Pa
|-
| rowspan=2|
| rowspan=2 style="text-align:right" | 93
| rowspan=2 style="text-align:right" | 138
| rowspan=2|231.03825(5)
| rowspan=2|48.8(2) min
| (98%)
| 231U
| rowspan=2|(5/2)(+#)
| rowspan="2" |
|-
| (2%)
| 227Pa
|-
| rowspan=2|
| rowspan=2 style="text-align:right" | 93
| rowspan=2 style="text-align:right" | 139
| rowspan=2|232.04011(11)#
| rowspan=2|14.7(3) min
| (99.99%)
| 232U
| rowspan=2|(4+)
| rowspan="2" |
|-
| (.003%)
| 228Pa
|-
| rowspan=2|
| rowspan=2 style="text-align:right" | 93
| rowspan=2 style="text-align:right" | 140
| rowspan=2|233.04074(5)
| rowspan=2|36.2(1) min
| (99.99%)
| 233U
| rowspan=2|(5/2+)
| rowspan="2" |
|-
| (.001%)
| 229Pa
|-
|
| style="text-align:right" | 93
| style="text-align:right" | 141
| 234.042895(9)
| 4.4(1) d
|
| 234U
| (0+)
|
|-
| rowspan=2|
| rowspan=2 style="text-align:right" | 93
| rowspan=2 style="text-align:right" | 142
| rowspan=2|235.0440633(21)
| rowspan=2|396.1(12) d
|
| 235U
| rowspan=2|5/2+
| rowspan="2" |
|-
| (.0026%)
| 231Pa
|-
| rowspan=3|
| rowspan=3 style="text-align:right" | 93
| rowspan=3 style="text-align:right" | 143
| rowspan=3|236.04657(5)
| rowspan=3|1.54(6)×105 y
| (87.3%)
| 236U
| rowspan=3|(6−)
| rowspan="3" |
|-
| (12.5%)
| 236Pu
|-
| (.16%)
| 232Pa
|-
| rowspan=2 style="text-indent:1em" |
| rowspan=2 colspan="3" style="text-indent:2em" | 60(50) keV
| rowspan=2|22.5(4) h
| (52%)
| 236U
| rowspan=2|1
| rowspan="2" |
|-
| (48%)
| 236Pu
|-
| rowspan=3|
| rowspan=3 style="text-align:right" | 93
| rowspan=3 style="text-align:right" | 144
| rowspan=3|237.0481734(20)
| rowspan=3|2.144(7)×106 y
|
| 233Pa
| rowspan=3|5/2+
| rowspan="3" |痕量
|-
| (2×10−10%)
| (various)
|-
| (4×10−12%)
| 207Tl
30Mg
|-
|
| style="text-align:right" | 93
| style="text-align:right" | 145
| 238.0509464(20)
| 2.117(2) d
|
| 238Pu
| 2+
|
|-
| style="text-indent:1em" |
| colspan="3" style="text-indent:2em" | 2300(200)# keV
| 112(39) ns
|
|
|
|
|-
|
| style="text-align:right" | 93
| style="text-align:right" | 146
| 239.0529390(22)
| 2.356(3) d
|
| 239Pu
| 5/2+
|痕量
|-
| rowspan=2 style="text-indent:1em" |
| rowspan=2 colspan="3" style="text-indent:2em" | 20(15) keV
| rowspan=2|7.22(2) min
| (99.89%)
| 240Pu
| rowspan=2|1(+)
| rowspan="2" |
|-
| IT (.11%)
| 240Np
|-
|
| style="text-align:right" | 93
| style="text-align:right" | 148
| 241.05825(8)
| 13.9(2) min
|
| 241Pu
| (5/2+)
|
|-
|
| style="text-align:right" | 93
| style="text-align:right" | 149
| 242.06164(21)
| 2.2(2) min
|
| 242Pu
| (1+)
|
|-
| style="text-indent:1em" |
| colspan="3" style="text-indent:2em" | 0(50)# keV
| 5.5(1) min
|
|
| 6+#
|
|-
|
| style="text-align:right" | 93
| style="text-align:right" | 150
| 243.06428(3)#
| 1.85(15) min
|
| 243Pu
| (5/2−)
|
|-
|
| style="text-align:right" | 93
| style="text-align:right" | 151
| 244.06785(32)#
| 2.29(16) min
|
| 244Pu
| (7−)
|
|}
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 [https://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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