<page_title> Periodic table </page_title> <section_title> Overview </section_title> <table> <cell> Hydro­gen1H​1.008 <col_header> 1 </col_header> <row_header> Period 1 </row_header> </cell> <cell> Oga­nesson118Og​[294] <col_header> 18 </col_header> <row_header> 7 </row_header> </cell> </table>
The periodic table has 118 elements, from element 1 (hydrogen) to 118 (oganesson).