(Polar molecules, Non-polar molecules, etc.)
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As soon as a lone pair exists on a central atom, there is a tendency to have the lone pair occupy an orbital with an s-contribution as high as possible and to have bonding orbitals with a maximized p-contribution. p-orbitals, having a direction, can form stronger σ bonds due to better overlap. This is why the bond angle drops quickly when comparing second-period to third-period central elements to close to 90∘. Lone pairs on non-central atoms result in the repulsion of electrons creating different bond angles.
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