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Does anyone know if we have to know the bond angles relative to each other? Like with NH3 and H2O, I'm pretty sure he said we don't need to know the specific bind angles (107 and 104.5), but do we have to know that H2O has a smaller angle than NH3? Or is it enough to know that they're both a little less than 109.5?
If necessary we could probably reason that H2O has a smaller bond angle than NH3 because the O has two lone pairs, and the interactions between them are stronger than those between bonded atoms so they push the bonds further and squeeze the angle smaller.
I don't think we need to know the specific bond angles, but we should know NH3 bond angles are more than H20 angles because we can look at how many bonding pairs there are versus how many lone pairs there are. The bond angles in H20 are less than NH3 because H20 has more lone pair electrons, pushing the bound H towards each other.
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