L. C. Allen has suggested that a more meaningful formal charge can be obtained by taking...

L. C. Allen has suggested that a more meaningful formal charge can be obtained by taking into account the electronegativities of the atoms involved. Allen’s formula for this type of charge—referred to as the Lewis–Langmuir (L–L) charge —of an atom, A, bonded to another atom, B, is L9L charge = (US) group number of A – number of unshared electrons on A – ( number of bonds between A and B)

where designate the electronegativities. Using this equation, calculate the L–L charges for CO, NO^-, and HF, and compare the results with the corresponding formal charges. Do you think the L–L charges are a better representation of electron distribution? (See L. C. Allen, J. Am. Chem. Soc. , 1989 , 111 , 9115; L. D. Garner, T. L. Meek, B. G. Patrick, THEOCHEM , 2003 , 620 , 43.)