(Polar molecules, Non-polar molecules, etc.)
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Think about it as if you saw the shape of the molecule blown up in size, like when Lavelle took off an atom from the Trig. Bipyramidal shape to demonstrate the see saw shape. You can't "see" Lone pairs, so they shouldn't contribute to the shape of the molecule since there is no atom being bound there. More important to know how they affect the bond angles.
Atoms of the non-central atoms are often only bonded with the central atom while the central atom is bonded to multiple atoms. Hence, the lone pairs on the central atom affect all of the atoms surrounding it but the lone pairs on the non-central atoms have no other atoms to affect.
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