<P> All the elements from atomic numbers 1 ( hydrogen ) through 118 ( oganesson ) have been either discovered or synthesized , completing the first seven rows of the periodic table . The first 98 elements exist in nature , although some are found only in trace amounts and others were synthesized in laboratories before being found in nature . Elements 99 to 118 have only been synthesized in laboratories or nuclear reactors . The synthesis of elements having higher atomic numbers is currently being pursued : these elements would begin an eighth row , and theoretical work has been done to suggest possible candidates for this extension . Numerous synthetic radionuclides of naturally occurring elements have also been produced in laboratories . </P>
<P> All the elements from atomic numbers 1 ( hydrogen ) through 118 ( oganesson ) have been either discovered or synthesized , completing the first seven rows of the periodic table . The first 98 elements exist in nature , although some are found only in trace amounts and others were synthesized in laboratories before being found in nature . Elements 99 to 118 have only been synthesized in laboratories or nuclear reactors . The synthesis of elements having higher atomic numbers is currently being pursued : these elements would begin an eighth row , and theoretical work has been done to suggest possible candidates for this extension . Numerous synthetic radionuclides of naturally occurring elements have also been produced in laboratories . </P>
what is the total number of elements in the periodic table
what is the total number of elements in the periodic table
118
118