(Polar molecules, Non-polar molecules, etc.)
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Bond angles will deviate from their ideal values according to the rule that lone pairs repel other electrons more strongly than bonding pairs. Although lone pairs are clearly smaller than atoms, they need to be closer to the nucleus of an atom than a bonding pair. Being closer to the central atom causes lone-pairs take up more of the available 'bonding space'.
Lone pairs of a molecules make the structure of a molecule distorted because the lone pairs repulsions are stronger than the repulsions between bond pair repulsions. This makes the angles between the atoms slightly smaller!
For an example, you can take a look at a water molecule, which would have 180 degree bond angles if not for the lone pairs which cause the ultimate shape to be bent instead of linear, and the bond angles to be smaller.
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