{{위키데이터 속성 추적}}
'''[[프랑슘]]'''은 [[안정 동위 원소]]가 존재하지 않으며, 오직 [[방사성 동위 원소]]로만 이루어져 있다. 프랑슘 동위 원소 중 가장 안정한 것은 <sup>223</sup>Fr으로 반감기는 22분이며, 자연에서 [[우라늄-235|<sup>235</sup>U]]의 중간 [[붕괴 생성물]]로써 미량 존재한다. <sup>221</sup>Fr 또한 자연에 미량 존재한다. 한편, 현재까지 알려진 각 원소들의 가장 안정한 동위 원소들 중 프랑슘이 제일 불안정하다. 비록 원자 번호 106([[시보귬]]) 이상의 원소들의 가장 안정한 동위 원소의 반감기가 프랑슘보다 짧기는 하지만 이들 원소는 아직까지 발견된 동위 원소의 개수가 적어 반감기가 비교적 긴 동위 원소들이 있을 가능성이 여전히 존재한다.

프랑슘의 표준 원자량은 정해져 있지 않다.


== 표 ==
{| class="wikitable" style="font-size:95%; white-space:nowrap"
! rowspan="2" | 핵종<br />기호
! rowspan="2" | 역사적 이름
! 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 />CD: [[뭉치 붕괴]]<br />IT: [[이성질핵 전이]]</ref>
! rowspan="2" | 붕괴<br />생성물
! rowspan="2" | 핵<br />스핀
! rowspan="2" | 전형적<br />동위 원소<br />구성비<br />(몰 분율)
! rowspan="2" | 자연적<br />구성비<br />변동 범위<br />(몰 분율)
|-
! colspan="3" | 들뜬 에너지
|-
| <sup>199</sup>Fr
|
| style="text-align:right" | 87
| style="text-align:right" | 112
| 199.00726(4)
| 16(7) ms
|
|
| 1/2+#
|
|
|-
| <sup>200</sup>Fr
|
| style="text-align:right" | 87
| style="text-align:right" | 113
| 200.00657(8)
| 24(10) ms
| [[알파 붕괴|α]]
| <sup>196</sup>At
| 3+#
|
|
|-
| rowspan=2 style="text-indent:1em" | <sup>200m</sup>Fr
| rowspan=2|
| rowspan=2 colspan="3" style="text-indent:2em" | 60(110) keV
| rowspan=2|650(210) ms
| α
| <sup>196</sup>At
| rowspan=2|10-#
| rowspan=2|
| rowspan=2|
|-
| [[이성질핵 전이|IT]] (드묾)
| <sup>200</sup>Fr
|-
| rowspan=2|<sup>201</sup>Fr
| rowspan=2|
| rowspan=2 style="text-align:right" | 87
| rowspan=2 style="text-align:right" | 114
| rowspan=2|201.00386(8)
| rowspan=2|67(3) ms
| α (99%)
| <sup>197</sup>At
| rowspan=2|(9/2-)
| rowspan=2|
| rowspan=2|
|-
| β<sup>+</sup> (1%)
| <sup>201</sup>Rn
|-
| rowspan=2|<sup>202</sup>Fr
| rowspan=2|
| rowspan=2 style="text-align:right" | 87
| rowspan=2 style="text-align:right" | 115
| rowspan=2|202.00337(5)
| rowspan=2|290(30) ms
| α (97%)
| <sup>198</sup>At
| rowspan=2|(3+)
| rowspan=2|
| rowspan=2|
|-
| β<sup>+</sup> (3%)
| <sup>202</sup>Rn
|-
| rowspan=2 style="text-indent:1em" | <sup>202m</sup>Fr
| rowspan=2|
| rowspan=2 colspan="3" style="text-indent:2em" | 330(90)# keV
| rowspan=2|340(40) ms
| α (97%)
| <sup>198</sup>At
| rowspan=2|(10-)
| rowspan=2|
| rowspan=2|
|-
| β<sup>+</sup> (3%)
| <sup>202</sup>Rn
|-
| rowspan=2|<sup>203</sup>Fr
| rowspan=2|
| rowspan=2 style="text-align:right" | 87
| rowspan=2 style="text-align:right" | 116
| rowspan=2|203.000925(17)
| rowspan=2|0.55(2) s
| α (95%)
| <sup>199</sup>At
| rowspan=2|(9/2-)#
| rowspan=2|
| rowspan=2|
|-
| β<sup>+</sup> (5%)
| <sup>203</sup>Rn
|-
| rowspan=2|<sup>204</sup>Fr
| rowspan=2|
| rowspan=2 style="text-align:right" | 87
| rowspan=2 style="text-align:right" | 117
| rowspan=2|204.000653(26)
| rowspan=2|1.7(3) s
| α (96%)
| <sup>200</sup>At
| rowspan=2|(3+)
| rowspan=2|
| rowspan=2|
|-
| β<sup>+</sup> (4%)
| <sup>204</sup>Rn
|-
| rowspan=2 style="text-indent:1em" | <sup>204m1</sup>Fr
| rowspan=2|
| rowspan=2 colspan="3" style="text-indent:2em" | 50(4) keV
| rowspan=2|2.6(3) s
| α (90%)
| <sup>200</sup>At
| rowspan=2|(7+)
| rowspan=2|
| rowspan=2|
|-
| β<sup>+</sup> (10%)
| <sup>204</sup>Rn
|-
| style="text-indent:1em" | <sup>204m2</sup>Fr
| 
| colspan="3" style="text-indent:2em" | 326(4) keV
| 1.7(6) s
|
|
| (10-)
| 
| 
|-
| rowspan=2|<sup>205</sup>Fr
| rowspan=2|
| rowspan=2 style="text-align:right" | 87
| rowspan=2 style="text-align:right" | 118
| rowspan=2|204.998594(8)
| rowspan=2|3.80(3) s
| α (99%)
| <sup>201</sup>At
| rowspan=2|(9/2-)
| rowspan=2|
| rowspan=2|
|-
| β<sup>+</sup> (1%)
| <sup>205</sup>Rn
|-
| rowspan=2|<sup>206</sup>Fr
| rowspan=2|
| rowspan=2 style="text-align:right" | 87
| rowspan=2 style="text-align:right" | 119
| rowspan=2|205.99867(3)
| rowspan=2|~16 s
| β<sup>+</sup> (58%)
| <sup>206</sup>Rn
| rowspan=2|(2+,3+)
| rowspan=2|
| rowspan=2|
|-
| α (42%)
| <sup>202</sup>At
|-
| style="text-indent:1em" | <sup>206m1</sup>Fr
| 
| colspan="3" style="text-indent:2em" | 190(40) keV
| 15.9(1) s
|
|
| (7+)
| 
| 
|-
| style="text-indent:1em" | <sup>206m2</sup>Fr
|
| colspan="3" style="text-indent:2em" | 730(40) keV
| 700(100) ms
|
|
| (10-)
|
|
|-
| rowspan=2|<sup>207</sup>Fr
| rowspan=2|
| rowspan=2 style="text-align:right" | 87
| rowspan=2 style="text-align:right" | 120
| rowspan=2|206.99695(5)
| rowspan=2|14.8(1) s
| α (95%)
| <sup>203</sup>At
| rowspan=2|9/2-
| rowspan=2|
| rowspan=2|
|-
| β<sup>+</sup> (5%)
| <sup>207</sup>Rn
|-
| rowspan=2|<sup>208</sup>Fr
| rowspan=2|
| rowspan=2 style="text-align:right" | 87
| rowspan=2 style="text-align:right" | 121
| rowspan=2|207.99714(5)
| rowspan=2|59.1(3) s
| α (90%)
| <sup>204</sup>At
| rowspan=2|7+
| rowspan=2|
| rowspan=2|
|-
| β<sup>+</sup> (10%)
| <sup>208</sup>Rn
|-
| rowspan=2|<sup>209</sup>Fr
| rowspan=2|
| rowspan=2 style="text-align:right" | 87
| rowspan=2 style="text-align:right" | 122
| rowspan=2|208.995954(16)
| rowspan=2|50.0(3) s
| α (89%)
| <sup>205</sup>At
| rowspan=2|9/2-
| rowspan=2|
| rowspan=2|
|-
| β<sup>+</sup> (11%)
| <sup>209</sup>Rn
|-
| rowspan=2|<sup>210</sup>Fr
| rowspan=2|
| rowspan=2 style="text-align:right" | 87
| rowspan=2 style="text-align:right" | 123
| rowspan=2|209.996408(24)
| rowspan=2|3.18(6) min
| α (60%)
| <sup>206</sup>At
| rowspan=2|6+
| rowspan=2|
| rowspan=2|
|-
| β<sup>+</sup> (40%)
| <sup>210</sup>Rn
|-
| rowspan=2|<sup>211</sup>Fr
| rowspan=2|
| rowspan=2 style="text-align:right" | 87
| rowspan=2 style="text-align:right" | 124
| rowspan=2|210.995537(23)
| rowspan=2|3.10(2) min
| α (80%)
| <sup>207</sup>At
| rowspan=2|9/2-
| rowspan=2|
| rowspan=2|
|-
| β<sup>+</sup> (20%)
| <sup>211</sup>Rn
|-
| rowspan=2|<sup>212</sup>Fr
| rowspan=2|
| rowspan=2 style="text-align:right" | 87
| rowspan=2 style="text-align:right" | 125
| rowspan=2|211.996202(28)
| rowspan=2|20.0(6) min
| β<sup>+</sup> (57%)
| <sup>212</sup>Rn
| rowspan=2|5+
| rowspan=2|
| rowspan=2|
|-
| α (43%)
| <sup>208</sup>At
|-
| rowspan=2|<sup>213</sup>Fr
| rowspan=2|
| rowspan=2 style="text-align:right" | 87
| rowspan=2 style="text-align:right" | 126
| rowspan=2|212.996189(8)
| rowspan=2|34.6(3) s
| α (99.45%)
| <sup>209</sup>At
| rowspan=2|9/2-
| rowspan=2|
| rowspan=2|
|-
| β<sup>+</sup> (0.55%)
| <sup>213</sup>Rn
|-
| <sup>214</sup>Fr
|
| style="text-align:right" | 87
| style="text-align:right" | 127
| 213.998971(9)
| 5.0(2) ms
| α
| <sup>210</sup>At
| (1-)
|
|
|-
| style="text-indent:1em" | <sup>214m1</sup>Fr
|
| colspan="3" style="text-indent:2em" | 123(6) keV
| 3.35(5) ms
| α
| <sup>210</sup>At
| (8-)
|
|
|-
| style="text-indent:1em" | <sup>214m2</sup>Fr
|
| colspan="3" style="text-indent:2em" | 638(6) keV
| 103(4) ns
|
|
| (11+)
|
|
|-
| style="text-indent:1em" | <sup>214m3</sup>Fr
|
| colspan="3" style="text-indent:2em" | 6477+Y keV
| 108(7) ns
|
|
| (33+)
|
|
|-
| <sup>215</sup>Fr
|
| style="text-align:right" | 87
| style="text-align:right" | 128
| 215.000341(8)
| 86(5) ns
| α
| <sup>211</sup>At
| 9/2-
|
|
|-
| rowspan=2|<sup>216</sup>Fr
| rowspan=2|
| rowspan=2 style="text-align:right" | 87
| rowspan=2 style="text-align:right" | 129
| rowspan=2|216.003198(15)
| rowspan=2|0.70(2) µs
| α
| <sup>212</sup>At
| rowspan=2|(1-)
| rowspan=2|
| rowspan=2|
|-
| β<sup>+</sup> (2&times;10<sup>−7</sup>%)
| <sup>216</sup>Rn
|-
| <sup>217</sup>Fr
|
| style="text-align:right" | 87
| style="text-align:right" | 130
| 217.004632(7)
| 16.8(19) µs
| α
| <sup>213</sup>At
| 9/2-
|
|
|-
| <sup>218</sup>Fr
|
| style="text-align:right" | 87
| style="text-align:right" | 131
| 218.007578(5)
| 1.0(6) ms
| α
| <sup>214</sup>At
| 1-
|
|
|-
| rowspan=2 style="text-indent:1em" | <sup>218m1</sup>Fr
| rowspan=2|
| rowspan=2 colspan="3" style="text-indent:2em" | 86(4) keV
| rowspan=2|22.0(5) ms
| α
| <sup>214</sup>At
| rowspan=2|
| rowspan=2|
| rowspan=2|
|-
| IT (드묾)
| <sup>218</sup>Fr
|-
| style="text-indent:1em" | <sup>218m2</sup>Fr
|
| colspan="3" style="text-indent:2em" | 200(150)# keV
|
|
|
| high
|
|
|-
| <sup>219</sup>Fr
|
| style="text-align:right" | 87
| style="text-align:right" | 132
| 219.009252(8)
| 20(2) ms
| α
| <sup>215</sup>At
| 9/2-
|
|
|-
| rowspan=2|<sup>220</sup>Fr
| rowspan=2|
| rowspan=2 style="text-align:right" | 87
| rowspan=2 style="text-align:right" | 133
| rowspan=2|220.012327(4)
| rowspan=2|27.4(3) s
| α (99.65%)
| <sup>216</sup>At
| rowspan=2|1+
| rowspan=2|
| rowspan=2|
|-
| β<sup>-</sup> (0.35%)
| <sup>220</sup>Ra
|-
| rowspan=3|<sup>221</sup>Fr
| rowspan=3|
| rowspan=3 style="text-align:right" | 87
| rowspan=3 style="text-align:right" | 134
| rowspan=3|221.014255(5)
| rowspan=3|4.9(2) min
| α (99.9%)
| <sup>217</sup>At
| rowspan=3|5/2-
| rowspan=3|미량<ref group="n"><sup>237</sup>[[넵투늄|Np]]의 중간 [[붕괴 생성물]]</ref>
| rowspan=3|
|-
| β<sup>-</sup> (0.1%)
| <sup>221</sup>Ra
|-
| [[뭉치 붕괴|CD]] (8.79&times;10<sup>−11</sup>%)
| <sup>207</sup>Tl<br />[[탄소-14|<sup>14</sup>C]]
|-
| <sup>222</sup>Fr
|
| style="text-align:right" | 87
| style="text-align:right" | 135
| 222.017552(23)
| 14.2(3) min
| β<sup>-</sup>
| <sup>222</sup>Ra
| 2-
|
|
|-
| rowspan=2|<sup>223</sup>Fr
| rowspan=2|[[악티늄]] K
| rowspan=2 style="text-align:right" | 87
| rowspan=2 style="text-align:right" | 136
| rowspan=2|223.0197359(26)
| rowspan=2|22.00(7) min
| β<sup>-</sup> (99.99%)
| <sup>223</sup>Ra
| rowspan=2|3/2(-)
| rowspan=2|미량<ref group="n">[[우라늄-235|<sup>235</sup>U]]의 중간 [[붕괴 생성물]]</ref>
| rowspan=2|
|-
| α (0.006%)
| <sup>219</sup>At
|-
| <sup>224</sup>Fr
|
| style="text-align:right" | 87
| style="text-align:right" | 137
| 224.02325(5)
| 3.33(10) min
| β<sup>-</sup>
| <sup>224</sup>Ra
| 1-
|
|
|-
| <sup>225</sup>Fr
|
| style="text-align:right" | 87
| style="text-align:right" | 138
| 225.02557(3)
| 4.0(2) min
| β<sup>-</sup>
| <sup>225</sup>Ra
| 3/2-
|
|
|-
| <sup>226</sup>Fr
|
| style="text-align:right" | 87
| style="text-align:right" | 139
| 226.02939(11)
| 49(1) s
| β<sup>-</sup>
| <sup>226</sup>Ra
| 1-
|
|
|-
| <sup>227</sup>Fr
|
| style="text-align:right" | 87
| style="text-align:right" | 140
| 227.03184(11)
| 2.47(3) min
| β<sup>-</sup>
| <sup>227</sup>Ra
| 1/2+
|
|
|-
| <sup>228</sup>Fr
|
| style="text-align:right" | 87
| style="text-align:right" | 141
| 228.03573(22)#
| 38(1) s
| β<sup>-</sup>
| <sup>228</sup>Ra
| 2-
|
|
|-
| <sup>229</sup>Fr
|
| style="text-align:right" | 87
| style="text-align:right" | 142
| 229.03845(4)
| 50.2(4) s
| β<sup>-</sup>
| <sup>229</sup>Ra
| (1/2+)#
|
|
|-
| <sup>230</sup>Fr
|
| style="text-align:right" | 87
| style="text-align:right" | 143
| 230.04251(48)#
| 19.1(5) s
| β<sup>-</sup>
| <sup>230</sup>Ra
|
|
|
|-
| <sup>231</sup>Fr
|
| style="text-align:right" | 87
| style="text-align:right" | 144
| 231.04544(50)#
| 17.6(6) s
| β<sup>-</sup>
| <sup>231</sup>Ra
| (1/2+)#
|
|
|-
| <sup>232</sup>Fr
|
| style="text-align:right" | 87
| style="text-align:right" | 145
| 232.04977(69)#
| 5(1) s
| β<sup>-</sup>
| <sup>232</sup>Ra
|
|
|
|}

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

{{동위 원소 색인}}

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