Click to select the correct answers. click again to unselect answers. leave the incorrect answers unselected. nuclear fission and fusion both affect the nucleus of an atom. choose all of the items below that are correct. the final products of fission and fusion are elements that are different than the original fusion involves the splitting apart of large atoms into smaller ones fission occurs mostly with elements heavier than lead on the periodic table two hydrogen atoms can go through fission to form helium fusion and fission involve a loss or gain of electrons