<page_title> Chemical element </page_title> <section_title> List of the 118 known chemical elements </section_title> <table> <cell> 118 <col_header> List of chemical elements </col_header> <col_header> Z </col_header> <col_header>  </col_header> </cell> <cell> Oganesson <col_header> List of chemical elements </col_header> <col_header> Element </col_header> <col_header>  </col_header> </cell> <cell> [294] <col_header> List of chemical elements </col_header> <col_header> Atomic weight (u (±)) </col_header> <col_header>  </col_header> </cell> </table>
The heaviest element is element 118, oganesson.