(Polar molecules, Non-polar molecules, etc.)
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Repulsion strength is strongest between two lone pairs of electrons and weakest between two bonds (repulsion strength between a lone pair and a bond is in between these two). Therefore, lone pairs have a bigger effect on the bond angle than a bond.
The order of repulsion strength in bonds from strongest to weakest is: lone-lone pair, lone-bonding pair, bonding-bonding pair. Therefore, lone pairs have the most repulsion strength among electrons. This causes bond angles to decrease because the strength of the lone pairs force the bound pairs to be closer together under VSEPR theory.
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