<P> The first element discovered through synthesis was technetium -- its discovery being definitely confirmed in 1936 . This discovery filled a gap in the periodic table , and the fact that no stable isotopes of technetium exist explains its natural absence on Earth ( and the gap ) . With the longest - lived isotope of technetium , Tc - 98 , having a 4.2 - million - year half - life , no technetium remains from the formation of the Earth . Only minute traces of technetium occur naturally in the Earth 's crust -- as a spontaneous fission product of uranium - 238 or by neutron capture in molybdenum ores -- but technetium is present naturally in red giant stars . </P>
<P> The first element discovered through synthesis was technetium -- its discovery being definitely confirmed in 1936 . This discovery filled a gap in the periodic table , and the fact that no stable isotopes of technetium exist explains its natural absence on Earth ( and the gap ) . With the longest - lived isotope of technetium , Tc - 98 , having a 4.2 - million - year half - life , no technetium remains from the formation of the Earth . Only minute traces of technetium occur naturally in the Earth 's crust -- as a spontaneous fission product of uranium - 238 or by neutron capture in molybdenum ores -- but technetium is present naturally in red giant stars . </P>
which is the first artificial produced element in the periodic table
which is the first artificial produced element in the periodic table
technetium
technetium