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| Isotopes of Francium |
 Notes
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| Francium-223 is the most stable isotope with a half-llife of 21.8 minutes, and it is highly unlikely that an isotope of francium with a longer half-llife will ever be discovered or synthesized. |
 Notable Isotopes
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 221Fr [134 neutrons] |
 Abundance: synthetic
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| Half life: 4.8 minutes [ Alpha Decay ]
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| Decay Energy: 6.457MeV |
| Decays to 217At.
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| 222Fr [135 neutrons] |
| Abundance: synthetic
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| Half life: 14.2 minutes [ beta- ]
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| Decay Energy: 2.033MeV |
| Decays to 222Ra.
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| 223Fr [136 neutrons] |
| Abundance: 100%
|
| Half life: 22.00 minutes [ beta- ]
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| Decay Energy: 1.149MeV |
| Decays to 221Ra.
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| Half life: 22.00 minutes [ Alpha Decay ]
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| Decay Energy: 5.430MeV |
| Decays to 219At.
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