(Polar molecules, Non-polar molecules, etc.)
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The two molecules attached to the central atom are generally more electronegative than the central atom. There must be lone pairs on the molecule with a 120 degree bond angle so that the otherwise linear molecule "bends" downward through electron repulsion with these more electronegative atoms.
Since bond angles are affected by the presence of lone pairs of electrons at the central atom, we can tell if there are lone pairs when a picture only shows bonded pairs/atoms. A lone pair of electrons at the central atom would always repel the shared pair/bonded pair which is why the 120-degree angle would be formed. If there are no lone pairs, the bonded pairs would try to be as far away from each other as possible which would be 180 degrees, and the lone pairs prevent them from doing that (however 180 degrees between bonded pairs can still have lone pairs). Sorry if that was confusing but that is my thought process and I'm not 100% if it's correct.
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