LithiumFlourineSulfurCalciumNitrogenAluminum
FluorineAtoms can attract additional electrons if there is room for them in the valence energy levelWhen an extra electron moves into the valence shell, it can feel the attraction exerted by the effective nuclear chargeBecause the effective nuclear charge is largest for the elements on the right side of the periodic table, those atoms provide the greatest attraction for electrons and have the greatest tendency to gain electrons.
