{{위키데이터 속성 추적}}
'''[[페르뮴]]'''은 [[인공 원소]]로 표준 원자량은 정해져 있지 않고 [[안정 동위 원소]]가 존재하지 않는다. 최초로 발견된 [[동위 원소]]는 <sup>255</sup>Fm로, 1952년 [[핵실험]]의 [[낙진]]에서 처음 발견되었다. [[원자량]] 241에서 260 사이에 총 20가지의 [[방사성 동위 원소]]와 2가지의 [[이성질핵]]이 알려져 있으며, 이 중 <sup>260</sup>Fm은 아직 확인되지 않았다. 반감기가 가장 긴 동위 원소는 <sup>257</sup>Fm로, 반감기는 100.5일이다.

== 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>241</sup>Fm
| rowspan=2 style="text-align:right" | 100
| rowspan=2 style="text-align:right" | 141
| rowspan=2|241.07421(32)#
| rowspan=2|730(60) µs
| [[자발 핵분열|SF]](>78%)
| 다양
| rowspan=2|5/2#+
|-
| [[알파 붕괴|α]] (<14%)
| <sup>237</sup>Cf
|-  
| rowspan=2|<sup>242</sup>Fm
| rowspan=2 style="text-align:right" | 100
| rowspan=2 style="text-align:right" | 142
| rowspan=2|242.07343(43)#
| rowspan=2|0.8(2) ms
| [[자발 핵분열|SF]]
| 다양
| rowspan=2|0+
|-
| [[알파 붕괴|α]] (드묾)
| <sup>238</sup>Cf
|-
| rowspan=3|<sup>243</sup>Fm
| rowspan=3 style="text-align:right" | 100
| rowspan=3 style="text-align:right" | 143
| rowspan=3|243.07447(23)#
| rowspan=3|231(9) ms
| α (91%)
| <sup>239</sup>Cf
| rowspan=3|7/2-#
|-
| SF (9%)
| 다양
|-
| β<sup>+</sup> (드묾)
| <sup>243</sup>Es
|-
| rowspan=2|<sup>244</sup>Fm
| rowspan=2 style="text-align:right" | 100
| rowspan=2 style="text-align:right" | 144
| rowspan=2|244.07404(22)#
| rowspan=2|3.12(8) ms
| SF (99%)
| 다양
| rowspan=2|0+
|-
| α (1%)
| <sup>240</sup>Cf
|-
| rowspan=3|<sup>245</sup>Fm
| rowspan=3 style="text-align:right" | 100
| rowspan=3 style="text-align:right" | 145
| rowspan=3|245.07535(21)#
| rowspan=3|4.2(13) s
| α (95.7%)
| <sup>241</sup>Cf
| rowspan=3|1/2+#
|-
| β<sup>+</sup> (4.2%)
| <sup>245</sup>Es
|-
| SF (0.13%)
| 다양
|-
| rowspan=4|<sup>246</sup>Fm
| rowspan=4 style="text-align:right" | 100
| rowspan=4 style="text-align:right" | 146
| rowspan=4|246.075350(17)
| rowspan=4|1.54(4) s
| α (85%)
| <sup>242</sup>Cf
| rowspan=4|0+
|-
| β<sup>+</sup> (10%)
| <sup>246</sup>Es
|-
| β<sup>+</sup>, SF (10%)
| 다양
|-
| SF (4.5%)
| 다양
|-
| rowspan=2|<sup>247</sup>Fm
| rowspan=2 style="text-align:right" | 100
| rowspan=2 style="text-align:right" | 147
| rowspan=2|247.07695(12)#
| rowspan=2|31(1) s
| α (>50%)
| <sup>243</sup>Cf
| rowspan=2|(7/2+)
|-
| β<sup>+</sup> (<50%)
| <sup>247</sup>Es
|-
| rowspan=3|<sup>248</sup>Fm
| rowspan=3 style="text-align:right" | 100
| rowspan=3 style="text-align:right" | 148
| rowspan=3|248.077186(9)
| rowspan=3|35.1(8) s
| α (93%)
| <sup>244</sup>Cf
| rowspan=3|0+
|-
| β<sup>+</sup> (7%)
| <sup>248</sup>Es
|-
| SF (0.10%)
| 다양
|-
| rowspan=2|<sup>249</sup>Fm
| rowspan=2 style="text-align:right" | 100
| rowspan=2 style="text-align:right" | 149
| rowspan=2|249.078928(7)
| rowspan=2|1.6(1) min
| β<sup>+</sup> (85%)
| <sup>249</sup>Es
| rowspan=2|(7/2+)#
|-
| α (15%)
| <sup>245</sup>Cf
|-
| rowspan=3|<sup>250</sup>Fm
| rowspan=3 style="text-align:right" | 100
| rowspan=3 style="text-align:right" | 150
| rowspan=3|250.079521(9)
| rowspan=3|30.4(15) min
| α (90%)
| <sup>246</sup>Cf
| rowspan=3|0+
|-
| [[전자 포획|ε]] (10%)
| <sup>250</sup>Es
|-
| SF (6.9&times;10<sup>−3</sup>%)
| 다양
|-
| style="text-indent:1em" | <sup>250m</sup>Fm
| colspan="3" style="text-indent:2em" | 1199.2(10) keV
| 1.92(5) s
| [[이성질핵 전이|IT]]
| <sup>250</sup>Fm
| (8-)
|-
| rowspan=2|<sup>251</sup>Fm
| rowspan=2 style="text-align:right" | 100
| rowspan=2 style="text-align:right" | 151
| rowspan=2|251.081540(16)
| rowspan=2|5.30(8) h
| β<sup>+</sup> (98.2%)
| <sup>251</sup>Es
| rowspan=2|(9/2-)
|-
| α (1.8%)
| <sup>247</sup>Cf
|-
| style="text-indent:1em" | <sup>251m</sup>Fm
| colspan="3" style="text-indent:2em" | 200.09(11) keV
| 21.1(16) µs
|
|
| (5/2+)
|-
| rowspan=3|<sup>252</sup>Fm
| rowspan=3 style="text-align:right" | 100
| rowspan=3 style="text-align:right" | 152
| rowspan=3|252.082467(6)
| rowspan=3|25.39(4) h
| α (99.99%)
| <sup>248</sup>Cf
| rowspan=3|0+
|-
| SF (0.0023%)
| 다양
|-
| β<sup>+</sup>β<sup>+</sup> (드묾)
| <sup>252</sup>Cf
|-
| rowspan=2|<sup>253</sup>Fm
| rowspan=2 style="text-align:right" | 100
| rowspan=2 style="text-align:right" | 153
| rowspan=2|253.085185(4)
| rowspan=2|3.00(12) d
| ε (88%)
| <sup>253</sup>Es
| rowspan=2|(1/2)+
|-
| α (12%)
| <sup>249</sup>Cf
|-
| rowspan=2|<sup>254</sup>Fm
| rowspan=2 style="text-align:right" | 100
| rowspan=2 style="text-align:right" | 154
| rowspan=2|254.0868544(30)
| rowspan=2|3.240(2) h
| α (99.94%)
| <sup>250</sup>Cf
| rowspan=2|0+
|-
| SF (0.0592%)
| 다양
|-
| rowspan=2|<sup>255</sup>Fm
| rowspan=2 style="text-align:right" | 100
| rowspan=2 style="text-align:right" | 155
| rowspan=2|255.089964(5)
| rowspan=2|20.07(7) h
| α
| <sup>251</sup>Cf
| rowspan=2|7/2+
|-
| SF (2.4&times;10<sup>−5</sup>%)
| 다양
|-
| rowspan=2|<sup>256</sup>Fm
| rowspan=2 style="text-align:right" | 100
| rowspan=2 style="text-align:right" | 156
| rowspan=2|256.091774(8)
| rowspan=2|157.6(13) min
| SF (91.9%)
| 다양
| rowspan=2|0+
|-
| α (8.1%)
| <sup>252</sup>Cf
|-
| rowspan=2|<sup>257</sup>Fm<ref group="n">[[중성자 포획]]을 통해 붕괴하는 가장 무거운 핵종이다.</ref>
| rowspan=2 style="text-align:right" | 100
| rowspan=2 style="text-align:right" | 157
| rowspan=2|257.095106(7)
| rowspan=2|100.5(2) d
| α (99.79%)
| <sup>253</sup>Cf
| rowspan=2|(9/2+)
|-
| SF (0.21%)
| 다양
|-
| <sup>258</sup>Fm
| style="text-align:right" | 100
| style="text-align:right" | 158
| 258.09708(22)#
| 370(14) µs
| SF
| 다양
| 0+
|-
| <sup>259</sup>Fm
| style="text-align:right" | 100
| style="text-align:right" | 159
| 259.1006(3)#
| 1.5(3) s
| SF
| 다양
| 3/2+#
|-
| <sup>260</sup>Fm<ref group="n" name="uc">아직 존재가 확인되지 않았다.</ref><ref group="n">직접 합성되지는 않고 <sup>260</sup>[[멘델레븀|Md]]의 [[붕괴 생성물]]로 존재할 것이다.</ref>
| style="text-align:right" | 100
| style="text-align:right" | 160
| 260.10281(55)#
| 1# min
|
|
| 0+
|}

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

{{동위 원소 색인}}
{{전거 통제}}

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