(Polar molecules, Non-polar molecules, etc.)
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For repulsion strength, lone-lone pair has the highest repulsion strength, then it is lone-bonding pair and the weakest is bonding-bonding pair. Therefore, the lone pair electron forces the bonding electron closer together. This causes the angle to be slightly smaller than expected.
Lone pairs create strong repulsions since the charges are the same(negative). Therefore, they try to get away from each other and cause the bond angle to decrease. Also, the bonded atoms would most likely end up being close together since the lone pairs are getting away from each other.
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