<page_title> Isotopes of xenon </page_title> <section_title> List of isotopes </section_title> <table> <cell> 131mXe <col_header> nuclide symbol </col_header> <col_header> excitation energy </col_header> </cell> <cell> 11.934(21) d <col_header> half-life </col_header> </cell> </table>
Of known isomers, the longest-lived is ¹³¹ᵐXe with a half-life of 11.934 days.