Notes
| Isotopes of Francium |
| Notes
|
| 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  |
 221Fr [134 neutrons] |
 Abundance: synthetic
|
| Half life: 4.8 minutes [ Alpha Decay ]
|
| Decay Energy: 6.457 MeV |
| Decays to 217At.
|
| 222Fr [135 neutrons] |
| Abundance: synthetic
|
| Half life: 14.2 minutes [ beta- ]
|
| Decay Energy: 2.033 MeV |
| Decays to 222Ra.
|
| 223Fr [136 neutrons] |
| Abundance: 100%
|
| Half life: 22.00 minutes [ beta- ]
|
| Decay Energy: 1.149 MeV |
| Decays to 221Ra.
|
| Half life: 22.00 minutes [ Alpha Decay ]
|
| Decay Energy: 5.430 MeV |
| Decays to 219At.
|