An elusive intermediate of atmospheric reactions of HONO may be nitrosyl O-hydroxide, HOON. Electronic structure calculations seem to indicate that HOON is best represented by a combination of three resonance structures, with major contribution from a radical-pair structure (involving HO and NO radicals), significant contribution from a molecular structure, and a small contribution from an ion-pair structure (involving HO^- and NO⁺ ions). Use the information to represent the structure of HOON in terms of these three resonance structures.