Some chemists believe that satisfaction of the octet rule should be the top criterion for choosing the dominant Lewis structure of a molecule or ion. Other chemists believe that achieving the best formal charges should be the top criterion. Consider the di-hydrogen phosphate ion, H2PO4-, in which the H atoms are bonded to O atoms.
(a) What would be the predicted dominant Lewis structure if satisfying the octet rule is the top criterion?
(b) What would it be if achieving the best formal charges is the top criterion?
(c) Is there another Lewis structure you can draw that satisfies neither of these criteria?