4 regions of electron density

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Brice McKeown 3D
Posts: 35
Joined: Fri Sep 28, 2018 12:25 am

4 regions of electron density

Postby Brice McKeown 3D » Sun Nov 18, 2018 1:01 pm

Could someone please reiterate to me what Dr. Lavelle said about the bent shape when there is four regions of electron density and why we don't have the lone pairs at opposite sides of the central atom.

Chloe Qiao 4C
Posts: 65
Joined: Fri Sep 28, 2018 12:27 am

Re: 4 regions of electron density

Postby Chloe Qiao 4C » Sun Nov 18, 2018 2:20 pm

When there are four regions of electron density, the regions are tetrahedrally arranged. Just think about the model Dr. Lavelle used in class, when replacing a bonded atom with a lone pair, we are basically "taking off a yellow ball". There are no two balls that are arranged exactly opposite to each other in a tetrahedral model; therefore, no matter which two balls you take off, you will always get a shape that is bent instead of having two lone pairs opposite to each other.

janeane Kim4G
Posts: 31
Joined: Fri Sep 28, 2018 12:28 am

Re: 4 regions of electron density

Postby janeane Kim4G » Sun Nov 18, 2018 2:33 pm

When there are 4 regions of electron density, the molecule takes up a tetrahedral shape. The 2 lone pairs take up any 2 “spaces” in the shape. That leads to the molecule itself being a literal observed bent shape.

shouse1f
Posts: 63
Joined: Fri Sep 28, 2018 12:18 am

Re: 4 regions of electron density

Postby shouse1f » Sun Nov 18, 2018 3:43 pm

are lone pairs and bonding pairs both considered regions of electron density?


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