<page_title> Isotopes of fluorine </page_title> <section_title> List of isotopes </section_title> <table> <cell> 18F <col_header> nuclide symbol </col_header> <col_header> excitation energy </col_header> </cell> <cell> 109.739(9) min <col_header> half-life </col_header> </cell> </table>
The longest-lived isotope is ¹⁸F with a half-life of 109.739 minutes.