<page_title> Isotopes of francium </page_title> <section_title> List of isotopes </section_title> <table> <cell> 223Fr <col_header> nuclide symbol </col_header> <col_header> excitation energy </col_header> </cell> <cell> 22.00(7) min <col_header> half-life </col_header> </cell> <cell> Trace <col_header> representative isotopic composition (mole fraction) </col_header> </cell> </table>
²²³Fr had a half-life of 22 minutes, occurred in trace quantities as an intermediate decay product of ²³⁵U.