(Polar molecules, Non-polar molecules, etc.)
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If there are more lone pairs present, the repulsion that they cause forces the bonding atoms away causing there to be a decrease in bond angle size. Lavelle said you do not need to know the exact numbers but the idea that more lone pair electrons force bonding electrons closer together, decreasing angle size.
For each of the different molecular geometry shapes (VSEPR), I am memorizing the possible angles. Otherwise, I believe that is important to understand why an angle might be slightly less than expected (such as 107deg instead of expected 109.5deg) by understanding the role that lone pairs play in repulsion. Further, it is important to compare the different numbers of lone pairs present on the central atom and see the different bond lengths (1 having larger bond angles than 2, etc).
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