<page_title> Isotopes of thorium </page_title> <section_title> List of isotopes </section_title> <table> <cell> 231Th <col_header> nuclide symbol </col_header> <col_header> excitation energy </col_header> </cell> <cell> 231.0363043(19) <col_header> isotopic mass (u) </col_header> </cell> </table>
231Th has a mass of 231.0363043 grams/mole.