So, in other words, the more balanced electrons we have, the more our nuclear charge is. Effective nuclear charge. The more inner most electrons we have in the innermost shell, the smaller our effective nuclear charge. So once again, electronegativity arises from effective nuclear charge. The more dense electrons an atom has, the larger the effective nuclear charge is, the more electronegative the atom. And that's exactly why electronegativity increases as we go from lithium to fluorine.