Francium is a highly radioactive alkali metal with the symbol Fr and atomic number 87. It is one of the least stable elements on the periodic table, and it has no stable isotopes. The isotopes of francium are all radioactive, and the most commonly discussed isotopes are: 1. **Francium-223 (Fr-223)**: This is the most stable and the most naturally occurring isotope of francium, with a half-life of about 22 minutes.
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