<page_title> Isotopes of oxygen </page_title> <section_title> List of isotopes </section_title> <table> <cell> 15O <col_header> nuclide symbol </col_header> </cell> <cell> 122.24(16) s <col_header> half-life </col_header> </cell> </table>
The longest-lived radioisotope is ¹⁵O with a half-life of 122.24 seconds.