<P> All elements ranging from atomic numbers 1 ( hydrogen ) to 118 ( oganesson ) have been either discovered or synthesized , completing the first seven rows of the periodic table . The first 98 elements exist naturally , although some are found only in trace amounts and were synthesized in laboratories before being found in nature . Atomic numbers for 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 appearances for this extension . Numerous synthetic radionuclides of naturally occurring elements have also been produced in laboratories . </P>
<P> All elements ranging from atomic numbers 1 ( hydrogen ) to 118 ( oganesson ) have been either discovered or synthesized , completing the first seven rows of the periodic table . The first 98 elements exist naturally , although some are found only in trace amounts and were synthesized in laboratories before being found in nature . Atomic numbers for 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 appearances for this extension . Numerous synthetic radionuclides of naturally occurring elements have also been produced in laboratories . </P>
what is the 1st element in the periodic table
what is the 1st element in the periodic table
hydrogen
hydrogen