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To expand on that, if there is only one resonance structure, the bond lengths will be exactly the length of a single bond or a double bond, depending on what kind of bond it is. However, if there are multiple resonance structures, the bond length will be somewhere in between the length of a single bond and a double bond because it will be a hybrid of both.
Resonance structures are characterized by the difference in location of a bond (in this picture, the double bond in the molecule NO3-).
Since there is a double bond, the bond length of the N-O bonds will be shorter than that of a 'regular' single bond of N-O.
Therefore, resonance structure bond lengths will usually be between the bond lengths of a single and double bond of the elements in question.
If you are asked which structure has a longer bond length and both have double bonds, then check how many resonance structures each has. If one has four resonance structures and the other only has two, then you know the one with four resonance structures has longer bond lengths.
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