what are the resonance structures for OCN? three with N as the central atom and three with O as the central atom.
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The cyanate ion, OCN-, has three nonequivalent resonance structures. None of the three resonance structures have formal charges of zero on all atoms. The first resonance structure is not very likely because of the large formal charges (+1 and -2). The other two resonance structures, however, each have small formal charges. In this case, electronegativity can help determine the best resonance structure. The electronegativity of oxygen (3.5) is greater than that of nitrogen (3.0). Therefore, oxygen is more likely to carry a negative formal charge in a Lewis structure, and according to formal charges, the resonance structure on the right is most likely
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