<page_title> Isotopes of hafnium </page_title> <section_title> List of isotopes </section_title> <table> <cell> 178m2Hf <col_header> nuclide symbol </col_header> <col_header> excitation energy </col_header> </cell> <cell> 31(1) y <col_header> half-life </col_header> </cell> </table>
¹⁷⁸ᵐ²Hf has a half-life of 31 years.