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

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Fionna Shue 4L
Posts: 59
Joined: Fri Sep 28, 2018 12:18 am

AX2E3 Shape

Postby Fionna Shue 4L » Sun Nov 18, 2018 4:29 pm

Why is AX2E3 linear but AX2E2 bent?

Jessica Chen 1F
Posts: 61
Joined: Fri Sep 28, 2018 12:17 am

Re: AX2E3 Shape  [ENDORSED]

Postby Jessica Chen 1F » Sun Nov 18, 2018 4:37 pm

AX2E3 is linear because all three lone pairs are equatorial, leaving one upper axial and one lower axial atom that forms a linear shape.
AX2E2 is bent because the two lone pairs repel the two atoms (e.g. water molecule).

Jordan Y4D
Posts: 25
Joined: Fri Sep 28, 2018 12:27 am

Re: AX2E3 Shape

Postby Jordan Y4D » Sun Nov 18, 2018 5:01 pm

AX2E3 is like a trigonal bipyramidal shape, it has 5 regions of electron density. If you look at this shape, the easiest way to ensure you can fit 3 sets of lone pairs is to have the atoms be on the axial plane of the shape and the 3 lone pairs be at 120 degrees to each other.

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