Accroding to Molecular orbital theory, a molecule of H2 has two electrons in

H2 = Total number of electrons  = 1 + 1 = 2e-s [≤ 14 e-s]σ1s2 σ*1s0;B.O=Nb-Na2B·O=2-02=1In H2 molecule two electrons  are present in σ1smolecular orbital.