Answer to Nitro Resonance Structures

There is a third structure possible. It has a +2 formal charge on the nitrogen and single bonds to the two oxygens. Each oxygen has three nonbonding pairs of electrons and a -1 formal charge on each.

This structure is a minor contributor to the overall structure, such that Pauling himself says " . . . with perhaps a small contribution by . . . ." when discussing this third resonance structure.

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