As an atom's nucleus gets larger the electric charges repelling the protons get larger. To compensate for this greater
electric charge the atom
needs more neutrons to gain enough nuclear binding forces to overcome
the repulsion
needs fewer neutrons to gain enough nuclear binding forces to overcome
the repulsion.
needs more electrons to gain enough nuclear binding forces to overcome
the repulsion.
Eliminate
needs fewer electrons to gain enough nuclear binding forces to overcome
the repulsion