## How to Determine Electron Density

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

Mya Majewski 1L
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Joined: Fri Sep 25, 2015 3:00 am

### How to Determine Electron Density

How do you calculate the number of electron density regions?

Posts: 21
Joined: Fri Sep 25, 2015 3:00 am

### Re: How to Determine Electron Density

It's the number of bonds or lone pairs around it. For example NH3, the N is bonded to each H and has its own lone pair, so 4 regions of electron density

Leena Tran 2K
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Joined: Fri Sep 25, 2015 3:00 am

### Re: How to Determine Electron Density

Also, a bond is counted as a single region of electron density regardless of whether it is a single, double, or triple bond. For example, the Lewis Structure of phosphate (PO4^3-) shows it to have 3 single bonds and a double bond. There are 4 regions of electron density.

Sophia Xu 3F
Posts: 21
Joined: Fri Sep 25, 2015 3:00 am

### Re: How to Determine Electron Density

The number of bonds an atom has to form with other atoms + region of unpaired electrons.
Hope that helps!

Chem_Mod
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### Re: How to Determine Electron Density

Good answers. Remember, a double bond counts as just one region of electron density, not two. Likewise, a triple bond counts as one region of electron density.