5. How is metallic character related to ionization energy? A. When positive nuclear charge increases, electrons are pulled into inner energy levels instead of the valence shell. B. When positive nuclear charge increases, the energy needed to release electrons from the valence shell increases. C. When positive nuclear charge decreases, the energy needed to release electrons from the valence shell increases. D. When positive nuclear charge decreases, more electrons move from the inner shells into the valence shells.