## 3 regions of e- density

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

Tess McDaniel 1F
Posts: 16
Joined: Fri Sep 29, 2017 7:04 am

### 3 regions of e- density

In my notes I wrote that if there are three regions of electron density than you will get a 4sp^3 hybridized orbital, can someone explain where the 4 coefficient comes from here?

Jessica Schirmer 1J
Posts: 20
Joined: Fri Sep 29, 2017 7:04 am

### Re: 3 regions of e- density

If there are 3 regions of e- density, then the hybridized orbitals would be sp^2. The coefficient in front of the type of orbital, the "4" in your problem, describes the energy level in which they fall into.

For example, methane (CH4) has four regions of e- density, therefore has hybrid orbitals of 2sp^3 because they fall into the second energy level.

Erik Khong 2E
Posts: 50
Joined: Fri Sep 29, 2017 7:07 am

### Re: 3 regions of e- density

Pretty sure you accidentally wrote the wrong number. It's supposed to b 2sp^3.

Rachel Formaker 1E
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Joined: Fri Sep 29, 2017 7:04 am
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### Re: 3 regions of e- density

The coefficient when describing a hybridized orbital describes the energy level of the orbital being hybridized.
So in general, when there are 4 regions of electron density, there will be sp3 hybridization.

Using the coefficient 4 in 4sp3 means that the element with the hybridized orbitals is in Period 4 (like Ge, As, or Se).
In the problems we've been doing 2sp3 has appeared the most because we've been working primarily with elements like carbon, which is in Period 2.