<page_title> Isotopes of rhenium </page_title> <section_title> List of isotopes </section_title> <table> <cell> 185Re <col_header> nuclide symbol </col_header> <col_header> excitation energy </col_header> </cell> <cell> Observationally Stable <col_header> half-life </col_header> <col_header> decay mode(s) </col_header> <col_header> daughter isotope(s) </col_header> </cell> <cell> 187Re <col_header> nuclide symbol </col_header> <col_header> excitation energy </col_header> </cell> <cell> 41.2(2)×109 y <col_header> half-life </col_header> </cell> </table>
¹⁸⁵Re is stable and ¹⁸⁷Re has a half-life of 41.2×10⁹ years.