{{위키데이터 속성 추적}}
'''[[멘델레븀]]'''은 [[인공 원소]]로 표준 원자량은 정해져 있지 않고 [[안정 동위 원소]]가 존재하지 않는다. 처음 합성된 [[동위 원소]]는 <sup>256</sup>Md으로, 1955년에 발견되었다. 원자량 245에서 260 사이에 총 16가지의 [[방사성 동위 원소]]와 5가지의 [[이성질핵]]이 알려져 있다. 이들 중 가장 안정한 것은 <sup>258</sup>Md로, 반감기는 51.3일이다.

== 표 ==
{| class="wikitable" style="font-size:95%; white-space:nowrap"
! rowspan="2" | 핵종<br />기호
! Z([[양성자|p]])
! N([[중성자|n]])
! &nbsp;<br />동위 원소 질량 (u)<br />&nbsp;
! rowspan="2" | 반감기
! rowspan="2" | 붕괴<br />방식<ref>http://www.nucleonica.net/unc.aspx</ref><ref group="n">약자:<br />ε: [[전자 포획]]<br />IT: [[이성질핵 전이]]<br />SF: [[자발 핵분열]]</ref>
! rowspan="2" | 붕괴<br />생성물
! rowspan="2" | 핵<br />스핀
|-
! colspan="3" | 들뜬 에너지
|-
| rowspan=2|<sup>245</sup>Md
| rowspan=2 style="text-align:right" | 101
| rowspan=2 style="text-align:right" | 144
| rowspan=2|245.08081(33)#
| rowspan=2|0.90(25) ms
| [[자발 핵분열|SF]]
| 다양
| rowspan=2|(1/2-)#
|-
| [[알파 붕괴|α]] (드묾)
| <sup>241</sup>Es
|-
| rowspan=2 style="text-indent:1em" | <sup>245m</sup>Md
| rowspan=2 colspan="3" style="text-indent:2em" | 200(100)# keV
| rowspan=2|400(200) ms<br />[0.35(+23-16) s]
| α
| <sup>241</sup>Es
| rowspan=2|(7/2+)
|-
| [[베타 붕괴|β<sup>+</sup>]] (드묾)
| <sup>245</sup>Fm
|-
| rowspan=2|<sup>246</sup>Md
| rowspan=2 style="text-align:right" | 101
| rowspan=2 style="text-align:right" | 145
| rowspan=2|246.08171(28)#
| rowspan=2|1.0(4) s
| α
| <sup>242</sup>Es
| rowspan=2|
|-
| β<sup>+</sup> (드묾)
| <sup>246</sup>Fm
|-
| rowspan=2|<sup>247</sup>Md
| rowspan=2 style="text-align:right" | 101
| rowspan=2 style="text-align:right" | 146
| rowspan=2|247.08152(22)#
| rowspan=2|1.12(22) s
| SF
| 다양
| rowspan=2|1/2-#
|-
| α (드묾)
| <sup>243</sup>Es
|-
| rowspan=2 style="text-indent:1em" | <sup>247m</sup>Md
| rowspan=2 colspan="3" style="text-indent:2em" |
| rowspan=2|~0.2 s
| α (99.99%)
| <sup>243</sup>Es
| rowspan=2|
|-
| SF (10<sup>−4</sup>%)
| 다양
|-
| rowspan=3|<sup>248</sup>Md
| rowspan=3 style="text-align:right" | 101
| rowspan=3 style="text-align:right" | 147
| rowspan=3|248.08282(26)#
| rowspan=3|7(3) s
| β<sup>+</sup> (80%)
| <sup>248</sup>Fm
| rowspan=3|
|-
| α (20%)
| <sup>244</sup>Es
|-
| β<sup>+</sup>, SF (0.05%)
| 다양
|-
| rowspan=2|<sup>249</sup>Md
| rowspan=2 style="text-align:right" | 101
| rowspan=2 style="text-align:right" | 148
| rowspan=2|249.08291(22)#
| rowspan=2|24(4) s
| α (60%)
| <sup>245</sup>Es
| rowspan=2|(7/2-)
|-
| β<sup>+</sup> (40%)
| <sup>249</sup>Fm
|-
| style="text-indent:1em" | <sup>249m</sup>Md
| colspan="3" style="text-indent:2em" | 100(100)# keV
| 1.9(9) s
|
|
| (1/2-)
|-
| rowspan=3|<sup>250</sup>Md
| rowspan=3 style="text-align:right" | 101
| rowspan=3 style="text-align:right" | 149
| rowspan=3|250.08442(32)#
| rowspan=3|52(6) s
| β<sup>+</sup> (93%)
| <sup>250</sup>Fm
| rowspan=3|
|-
| α (7%)
| <sup>246</sup>Es
|-
| β<sup>+</sup>, SF (0.02%)
| 다양
|-
| rowspan=2|<sup>251</sup>Md
| rowspan=2 style="text-align:right" | 101
| rowspan=2 style="text-align:right" | 150
| rowspan=2|251.084774(20)
| rowspan=2|4.0(5) min
| β<sup>+</sup> (90%)
| <sup>251</sup>Fm
| rowspan=2|7/2-#
|-
| α (10%)
| <sup>247</sup>Es
|-
| rowspan=2|<sup>252</sup>Md
| rowspan=2 style="text-align:right" | 101
| rowspan=2 style="text-align:right" | 151
| rowspan=2|252.08643(14)#
| rowspan=2|2.3(8) min
| β<sup>+</sup> (50%)
| <sup>252</sup>Fm
| rowspan=2|
|-
| α (50%)
| <sup>248</sup>Es
|-
| rowspan=2|<sup>253</sup>Md
| rowspan=2 style="text-align:right" | 101
| rowspan=2 style="text-align:right" | 152
| rowspan=2|253.08714(3)#
| rowspan=2|12(8) min<br />[6(+12-3) min]
| β<sup>+</sup>
| <sup>253</sup>Fm
| rowspan=2|7/2-#
|-
| α
| <sup>249</sup>Es
|-
| rowspan=2|<sup>254</sup>Md
| rowspan=2 style="text-align:right" | 101
| rowspan=2 style="text-align:right" | 153
| rowspan=2|254.08959(11)#
| rowspan=2|10(3) min
| β<sup>+</sup>
| <sup>254</sup>Fm
| rowspan=2|(0-)
|-
| α (드묾)
| <sup>250</sup>Es
|-
| rowspan=2 style="text-indent:1em" | <sup>254m</sup>Md
| rowspan=2 colspan="3" style="text-indent:2em" | 50(100)# keV
| rowspan=2|28(8) min
| β<sup>+</sup>
| <sup>254</sup>Fm
| rowspan=2|(3-)
|-
| α (드묾)
| <sup>250</sup>Es
|-
| rowspan=3|<sup>255</sup>Md
| rowspan=3 style="text-align:right" | 101
| rowspan=3 style="text-align:right" | 154
| rowspan=3|255.091084(7)
| rowspan=3|27(2) min
| β<sup>+</sup> (92%)
| <sup>255</sup>Fm
| rowspan=3|(7/2-)
|-
| α (8%)
| <sup>251</sup>Es
|-
| SF (0.15%)
| 다양
|-
| rowspan=2|<sup>256</sup>Md
| rowspan=2 style="text-align:right" | 101
| rowspan=2 style="text-align:right" | 155
| rowspan=2|256.09389(13)#
| rowspan=2|77(2) min
| β<sup>+</sup> (89%)
| <sup>256</sup>Fm
| rowspan=2|(1-)
|-
| α (11%)
| <sup>252</sup>Es
|-
| rowspan=3|<sup>257</sup>Md
| rowspan=3 style="text-align:right" | 101
| rowspan=3 style="text-align:right" | 156
| rowspan=3|257.0955424(29)
| rowspan=3|5.52(5) h
| [[전자 포획|ε]] (84.8%)
| <sup>257</sup>Fm
| rowspan=3|(7/2-)
|-
| α (15.2%)
| <sup>253</sup>Es
|-
| SF (1%)
| 다양
|-
| rowspan=3|<sup>258</sup>Md
| rowspan=3 style="text-align:right" | 101
| rowspan=3 style="text-align:right" | 157
| rowspan=3|258.098431(5)
| rowspan=3|51.5(3) d
| α (99.99%)
| <sup>254</sup>Es
| rowspan=3|(8-)#
|-
| β<sup>-</sup> (0.0015%)
| <sup>258</sup>No
|-
| β<sup>+</sup> (0.0015%)
| <sup>258</sup>Fm
|-
| rowspan=4 style="text-indent:1em" | <sup>258m</sup>Md
| rowspan=4 colspan="3" style="text-indent:2em" | 0(200)# keV
| rowspan=4|57.0(9) min
| ε (70%)
| <sup>258</sup>Fm
| rowspan=4|1-#
|-
| SF (20%)
| 다양
|-
| β<sup>-</sup> (10%)
| <sup>258</sup>No
|-
| α (1.2%)
| <sup>254</sup>Es
|-
| rowspan=2|<sup>259</sup>Md<ref group="n">직접 합성되지 않고 <sup>259</sup>[[노벨륨|No]]의 [[붕괴 생성물]]로 존재할 것이다.</ref>
| rowspan=2 style="text-align:right" | 101
| rowspan=2 style="text-align:right" | 158
| rowspan=2|259.10051(22)#
| rowspan=2|1.60(6) h
| SF (98.7%)
| 다양
| rowspan=2|7/2-#
|-
| α (1.3%)
| <sup>255</sup>Es
|-
| rowspan=4|<sup>260</sup>Md
| rowspan=4 style="text-align:right" | 101
| rowspan=4 style="text-align:right" | 159
| rowspan=4|260.10365(34)#
| rowspan=4|27.8(8) d
| SF (85%)
| 다양
| rowspan=4|
|-
| α (5%)
| <sup>256</sup>Es
|-
| ε (5%)
| <sup>260</sup>Fm
|-
| β<sup>-</sup> (3.5%)
| <sup>260</sup>No
|-
| <sup>261</sup>Md
| style="text-align:right" | 101
| style="text-align:right" | 160
| 261.10583(62)#
| 40# min
| α
| <sup>257</sup>Es
| 7/2-#
|-
| <sup>262</sup>Md
| style="text-align:right" | 101
| style="text-align:right" | 161
| 262.10910(45)#
| 3# min
| SF
| 다양
| 
|}

== 각주 ==
{{각주}}
; 내용주
<references group="n" />

{{동위 원소 색인}}
{{전거 통제}}

[[분류:멘델레븀| 동위 원소]]
[[분류:멘델레븀 동위 원소]]
[[분류:원소별 동위 원소 목록]]