(Polar molecules, Non-polar molecules, etc.)
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Lone pairs have more repulsive energy than electrons engaged in a bond between two atoms because they aren't being "tied down" by the positive energy of two atoms. Thus they have more "push" per say and can repel nearby atoms more than bonded electrons can. When this happens, the nearby atoms are pushed away and toward each other to allow more room for the lone pair that takes up more space. This results in smaller bond angles between the atoms because they are now in closer proximity than when they were more evenly dispersed around the central atom.
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