(Polar molecules, Non-polar molecules, etc.)
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In general, since lone pairs have the greatest repulsion, put them wherever they will be farthest from each other or from other atoms. This will minimize the repulsion in the molecule and result in the most stable structure.
Starting with the base model where both bonds and lone pairs are included, you place the lone pairs where it will affect the least number of bonded pairs at the lowest angle. For example, let's say you first have a trigonal bipyramidal model and are trying where to place the lone pairs. You would place the lone pair on the one that mainly affects the two bonded pairs at 90 degrees (one of the equatorial atoms) and get a see-saw. You wouldn't place the lone pairs at one of the axial atoms because at the lowest angle (90 degrees) it will affect 3 bonded pairs (the horizontal).
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