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Bond energy is basically how much energy it would take to break the bond between atoms. Bonding in atoms occurs due to the interactions of the valence (outermost) level of the electrons. The further the atoms get from each other the weaker the bond becomes because these valence electrons don't interact as well and the protons in the nucleus of the more electronegative atom are less attracted to the other atom's electrons, thus the bond is weak and it takes less energy to break a weaker bond. This is basically the answer in a nutshell, there is much more detail to it but that would take a whole book to explain.

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Q: Why by increasing bond length bond energy will decrease?
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