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Polyatomic ions are atoms held together by covalent bonds as a group and that from CHM 1220 at Wayne State University
Resonance. 1  A reasonable Lewis structure for the nitrate polyatomic ion, NO3â, is below. 2  This Lewis structure shows two different types of bonds, single and double. Because it takes more energy to break a double bond than a single bond, we say that a double bond is stronger than a single bond. 3  This is not the case.