(Polar molecules, Non-polar molecules, etc.)
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If a lone pair is present then it will decrease the angles because it causes more repulsion. However, if it is a smaller atom that is present for example change F to H, then the bond angles will decrease. In contrast, if it is larger like a H to F then they will decrease the angles just as in the lone pairs. Smaller angles would be much less stable.
There are times where lone pairs are opposite each other, and the repulsive forces cancel each other out. For instance, in molecules that have trigonal bipyramidal electron arrangement (6 bonding spots), with bonded atoms and 2 lone pairs, the lone pairs on the top and bottom of the molecule cancel each other out, so the resulting shape is square planar, not bent.
There are many different structures that contain lone pairs. They are not only a bent shape-- this is the shape for a molecule with 2 bonds and one lone pair. It is a good idea to think that lone pairs will generally push the bonded atom away from it due to the fact that it takes up space but also because its negative charge causes repulsion.
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