(Polar molecules, Non-polar molecules, etc.)
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The angles for seesaw is <90 and <120 because for a normal trigonal bipyramidal, the bond angles are 90 and 120 so if you replaced one of the atoms with a lone pair, then it would repel the others, causing the bond angles to become smaller.
The bond angles for see saw would be slightly less than 90 from the atom on the axial axis and equatorial axis. And for the atoms on the equatorial axis, the angle would be slightly less than 120. This is due to the lonep pair that is present in the see saw structure.
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