<page_title> Timeline of chemical element discoveries </page_title> <section_title> Periodic table of Elements </section_title> <table> <cell> 118 Og <col_header> Periodic table by era of discovery vte </col_header> <col_header> 18 </col_header> <col_header>  </col_header> <col_header>  </col_header> <row_header> 7 </row_header> </cell> </table>
The discovery of the 118 chemical elements known to exist as of 2019 is presented in order.