<page_title> Isotopes of astatine </page_title> <section_title> List of isotopes </section_title> <table> <cell> 210At <col_header> nuclide symbol </col_header> <col_header> excitation energy </col_header> </cell> <cell> 8.1(4) h <col_header> half-life </col_header> </cell> <cell> 219At <col_header> nuclide symbol </col_header> <col_header> excitation energy </col_header> </cell> <cell> 56(3) s <col_header> half-life </col_header> </cell> </table>
The longest-lived isotope is ²¹⁰At, which has a half-life of 8.1 hours where as ²¹⁹At has a half-life of 56 seconds.