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Bond length decreases as the number of bonds increases since the two atoms are more strongly attracted to one another. For example, triple bonds are shorter than double bonds which are shorter than single bonds. When determining bond length, take the average of all the bond lengths in the resonance structures. It seems like it'd be more difficult, but it's actually quite simple since the bond lengths of a resonance structure are actually just a blend of all the bond lengths.
When the molecule has resonance structures, you need to find the average bond length. For example, if the molecule has a single bond in one form of resonance and a double bond in the other, you need to calculate the average of the two.
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