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The resonance terminology that accompanies use of more than one Lewis-type structure to describe delocalized bonding in molecules has been leading students astray for more than half a century. In this article I review the origin of the terminology and how the original usage has evolved to reduce confusion. I furthermore suggest that substitution of more easily understood terms that lack the gratuitous implications of the word resonance could finally eliminate the confusion.

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Purdtie Uniue rs it y , Lafa yette , Ind.The anion derived from a n aliphatic nitro compound is capable of covalency formation at either carbon o r oxygen; i.e., it i s a n ambident anion.