<page_title> Isotopes of lead </page_title> <section_title> List of isotopes </section_title> <table> <cell> 210Pb <col_header> nuclide symbol </col_header> <col_header> excitation energy </col_header> </cell> <cell> 22.3(22) y <col_header> half-life </col_header> </cell> </table>
²¹⁰Pb has the longest half-life of 22.3 years.