<Dd> Z e f f = ⟨ r ⟩ H ⟨ r ⟩ Z (\ displaystyle Z_ (\ mathrm (eff)) = (\ frac (\ langle r \ rangle _ (\ rm (H))) (\ langle r \ rangle _ (Z)))) </Dd> <Dl> <Dd> ⟨ r ⟩ H (\ displaystyle \ langle r \ rangle _ (\ rm (H))) is the mean radius of the orbital for hydrogen, and </Dd> <Dd> ⟨ r ⟩ Z (\ displaystyle \ langle r \ rangle _ (Z)) is the mean radius of the orbital for an electron configuration with nuclear charge Z . </Dd> </Dl> <Dd> ⟨ r ⟩ H (\ displaystyle \ langle r \ rangle _ (\ rm (H))) is the mean radius of the orbital for hydrogen, and </Dd> <Dd> ⟨ r ⟩ Z (\ displaystyle \ langle r \ rangle _ (Z)) is the mean radius of the orbital for an electron configuration with nuclear charge Z . </Dd>

Is effective nuclear charge the same as electronegativity