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How would you account for the following:...

How would you account for the following:
The N-O bond in `NO_2^(-)` is shorter than the N-O bond in `NO_3^(-)`.

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One of the bonds in `NO_2^(-)` is N=O, while the bonds in `NO_3^(-)` are N-O bonds. A double bond is always shorter than the single bond.
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