(Polar molecules, Non-polar molecules, etc.)
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When the lone pair is in the equatorial plane, it is only perpendicular to two atoms. If the lone pair was in the axial plane, it would be perpendicular to three atoms. Therefore, having a lone pair in the equatorial plane would minimize the repulsions created by the lone pair.
If the lone pair was on the axial plane, it would have a 90 degrees bond angle with 3 atoms. With the lone pair on the equatorial plane, it would have a 90 degrees bond with only 2 atoms. There is less repulsion by putting the lone pair on the equatorial plane so it should be there.
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