(Polar molecules, Non-polar molecules, etc.)

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Postby Cowasjee_Sanaea_3E » Tue Nov 01, 2016 10:11 pm

AX3E2 (3 bonds with 2 lone pairs) is considered T-shaped. However I would have thought it would be trigonal planar because the lone pairs would want to get as far away from one another as possible (such as at a 180 degree angle with the 3 bonds in the middle in a triangle shape with 120 degree angles). How come this is not the case?

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Re: T-Shaped?

Postby Jamie_Lin_3I » Tue Nov 01, 2016 10:19 pm

I think if the lone pairs occupy the axial positions, they would be as far from one another as possible, but the lone pairs would now have to repel 3 bonded pairs at the equatorial position. If the lone pairs occupy two of the three equatorial positions, then it would exert repulsion to only 2 axial bonded pairs (in 3-dimensions, one equatorial lone pair would align as a plane to only the 2 axial bonded pairs).

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