<page_title> Isotopes of protactinium </page_title> <section_title> List of isotopes </section_title> <table> <cell> 234mPa <col_header> nuclide symbol </col_header> <col_header> excitation energy </col_header> </cell> <cell> Uranium X2 Brevium <col_header> historic name </col_header> <col_header> excitation energy </col_header> </cell> <cell> 1.17(3) min <col_header> half-life </col_header> </cell> </table>
Protactinium-234m is a member of the uranium series with a half-life of 1.17 minutes.