(Polar molecules, Non-polar molecules, etc.)
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There is no "formula," but each type of shape has their own specific bond angles that you'll have to picture in your head and/or memorize. For example, a tetrahedral shape has bond angles of 109.5, and that's a number you should remember.
There isn't really a formula, I would just know the values of the main shapes. For example, know that trigonal planar is 120, tetrahedral is 109.5, and if there is a lone pair instead of a bond (such as in trigonal pyramidal), it would be slightly less than 109.5.
Is it possible to tell which molecules have smaller bond angles even when we're not sure exactly what the bond angles are? Like would the size of the atoms in the molecule have an effect on the bond angles, or is it just a matter of how many / what kind of electron pairs there are?
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