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I believe they bend away from each other because as the atoms are connected together in the molecule they continue to interact. Meaning, the non-central atoms of the molecule are trying to stay away from each other/ repel each other making the structure more angular. He used water as an example in lecture.
Another great example of a lewis structure bent is H20. The reason for this bending is because the lone pair of electrons have little more repulsion and cause the bonded electrons to get a bit closer together.
I think this unbalanced slanted structure is due to the fact that some elements have a higher binding affinity to electrons and pull them closer to their nucleus, creating partial charges that still repel other elements a little bit so that the structure is not perfect.
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