(Polar molecules, Non-polar molecules, etc.)
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This is because when there is a lone pair, the lone pair occupies a larger space and causes electron-electron repulsion, forcing all the other regions of electron density closer to each other and farther away from the lone pair. This is why the bond angle in molecules with a lone pair is slightly less than without a lone pair.
Lone pairs create a strong electron-electron repulsion which pushes all other atoms closer to together. For example, if you had a trigonal pyramidal with a lone pair at the top, it would push the atoms that are part of the structure closer together, creating a smaller bond angle between the atoms.
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