bond angles

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

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Jineava_To_3N
Posts: 35
Joined: Wed Sep 21, 2016 2:57 pm

bond angles

Postby Jineava_To_3N » Sun Oct 30, 2016 9:53 pm

What are the bond angles for seesaw, t-shaped, square pyramidal. and square planar? Specifically, is there a pattern or conceptual method to know the bond angles?

Miya McLaughlin 2B
Posts: 24
Joined: Wed Sep 21, 2016 2:57 pm
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Re: bond angles

Postby Miya McLaughlin 2B » Sun Oct 30, 2016 10:28 pm

The bond angles for a see-saw shape are 90 degrees, 180 degrees and 120 degrees.
T-shaped is 90 and 180.
Square-pyramidal is 90.
Square planar is also 90.

A good way to figure out the bond angles is to look first look at how many regions of electron density there are.
Take the see-saw shape for example. It has 5 regions, 4 are bonds and 1 is a lone pair. You would look at the shape with 5 atoms for reference, which would be trigonal bipyramidal. This shape has angles of 90, 120 and 180. The shape will be different because there are 4 atoms instead of 5 but the bond angles will be similar.

In short, use shapes without lone pairs as references to figure out bond angles.


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