(Polar molecules, Non-polar molecules, etc.)
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The see-saw shape is based off of the trigonal bipyramidal, as the molecule in question has 5 areas of electron density. But then you would just need to replace one of the bonds with a lone pair, and in this case it would be the equatorial bond, as you would only be strongly repelling against 2 axial bonds (instead of 3 with the other configuration). I would assume that the atoms on the axis wouldn't be bent because overall, this would preserve energy the best by creating smaller angles. If all 4 atoms were to be pushed downwards, as in a trigonal pyramidal, I think this arrangement would have larger angles throughout, and so wouldn't be as efficient. The see-saw shapes is picked because this way, the atoms are in the best configuration; the angles are at their optimum, of 2 90 degree angles and 120 degree angle, as opposed to the other configuration.
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