## Determining how many electron densities

$sp, sp^{2}, sp^{3}, dsp^{3}, d^{2}sp^{3}$

MedhaVallurupalli1F
Posts: 30
Joined: Wed Feb 27, 2019 12:15 am

### Determining how many electron densities

Do lone pairs count toward the number of electron densities? Or is it just the number of bonds? For example, if a F atom has three bonds and a lone pair, would it be three or four regions of e- density?

Yilun Ding
Posts: 31
Joined: Tue Jun 25, 2019 12:15 am

### Re: Determining how many electron densities

A lone pair is also an electron density. Therefore, a molecule with 3 bonding pairs and 1 lone pair should have 4 electron densities.

Posts: 36
Joined: Mon Jun 17, 2019 7:23 am

### Re: Determining how many electron densities

There would be four regions of electron densities. When determine shape we look at electron density and lone pairs count towards creating the overall shape and also have an effect on the bind angles.

Yiyang Jen Wang 4G
Posts: 76
Joined: Wed Nov 21, 2018 12:18 am

### Re: Determining how many electron densities

Yes! Lone pairs do count toward the number of electron densities! The F atom should have four regions of electron density.

AprilPaz
Posts: 51
Joined: Wed Sep 18, 2019 12:18 am

### Re: Determining how many electron densities

Lone pairs count as electron densities.

BCaballero_4F
Posts: 94
Joined: Wed Nov 14, 2018 12:22 am

### Re: Determining how many electron densities

Yes they do count, so for this example it would be 4 instead of 3.

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