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Usually when a bond is shorter it is stronger, because there are more electrons that are shared between ions which result in a stronger pull between the electrons and the atoms' nuclei. The same goes for why a longer bond is weaker.
A longer bond means a weaker bond as the interaction between the atoms is weaker. Shorter bonds mean a strong pull between the nuclei of the two atoms and thus it requires more energy to break which means it is stronger.
If a bond is longer, it is weaker than a bond that is shorter. This is why triple bonds are stronger than double bonds that are stronger than single bonds. Triple bonds have the shortest bond length and single bonds have the longest.
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