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Isotopes of the Element Francium

[Click for Main Data]

Most of the isotope data on this site has been obtained from the National Nuclear Data Center. Please visit their site for more information.

Naturally Occurring Isotopes

Francium has no naturally occurring isotopes.

Known Isotopes

Mass NumberHalf-lifeDecay ModeBranching Percentage
19912 millisecondsAlpha Decay> 0.00%
Electron CaptureNo Data Available
20049 millisecondsAlpha Decay100.00%
20162 millisecondsAlpha Decay100.00%
201m19 millisecondsAlpha Decay100.00%
2020.30 secondsAlpha Decay100.00%
202m0.29 secondsAlpha Decay100.00%
2030.55 secondsAlpha Decay<= 100.00%
2041.8 secondsAlpha Decay92.00%
Electron Capture8.00%
204m1.6 secondsAlpha Decay90.00%
Electron Capture10.00%
204m10.8 secondsAlpha Decay74.00%
Electron Capture26.00%
2053.97 secondsAlpha Decay98.50%
Electron Capture1.50%
206≈ 16 secondsAlpha Decay~ 84.00%
Electron Capture~ 16.00%
Electron Capture~ 16.00%
Alpha Decay~ 84.00%
206m0.7 secondsIsomeric Transition95.00%
Alpha Decay5.00%
20714.8 secondsAlpha Decay95.00%
Electron Capture5.00%
20859.1 secondsAlpha Decay89.00%
Electron Capture11.00%
20950.5 secondsAlpha Decay89.00%
Electron Capture11.00%
2103.18 minutesAlpha Decay71.00%
Electron Capture29.00%
2113.10 minutesAlpha Decay87.00%
Electron Capture13.00%
21220.0 minutesElectron Capture57.00%
Alpha Decay43.00%
21334.82 secondsAlpha Decay99.44%
Electron Capture0.56%
2145.0 millisecondsAlpha Decay100.00%
214m3.35 millisecondsAlpha Decay100.00%
21586 nanosecondsAlpha Decay100.00%
216700 nanosecondsAlpha Decay100.00%
21719 microsecondsAlpha Decay100.00%
2181.0 millisecondsAlpha Decay100.00%
218m22.0 millisecondsAlpha Decay<= 100.00%
Isomeric TransitionNo Data Available
21920 millisecondsAlpha Decay100.00%
22027.4 secondsAlpha Decay99.65%
Beta-minus Decay0.35%
221286.1 secondsAlpha Decay100.00%
Beta-minus Decay< 0.10%
22214.2 minutesBeta-minus Decay100.00%
22322.00 minutesAlpha Decay6.0×10-3 %
Beta-minus Decay99.99%
2243.33 minutesBeta-minus Decay100.00%
2253.95 minutesBeta-minus Decay100.00%
22649 secondsBeta-minus Decay100.00%
2272.47 minutesBeta-minus Decay100.00%
22838 secondsBeta-minus Decay<= 100.00%
22950.2 secondsBeta-minus Decay100.00%
23019.1 secondsBeta-minus Decay100.00%
23117.6 secondsBeta-minus Decay100.00%
2325.5 secondsBeta-minus Decay100.00%
233> 300 nanosecondsBeta-minus DecayNo Data Available