## Unhybridized orbitals

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

Katherine Fitzgerald 1A
Posts: 40
Joined: Fri Sep 29, 2017 7:05 am

### Unhybridized orbitals

I'm not completely clear on unhybridized orbitals. Can someone walk through a succinct explanation of how to predict which orbitals will be unhybridized, and why that is the case? Also, why are unhybridized orbitals always perpendicular/90 degrees to the the hybridized orbitals?

Chem_Mod
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### Re: Unhybridized orbitals

Remember that hybridizing hybridizes the different s p d orbitals. How many total orbitals would there be in an s and p? 4, 1 s and 3 p. In an sp3- which has 4 hybridized orbitals- all 4 ( 1 from s and 3 from p) become hybridized to sp3 orbitals.

For sp2, which has 3 hybridized orbitals, to make the 3 hybridized orbitals will use 1 from s and 2 from p, leaving out the extra third p orbital(the unhybridized orbital). Unhybridized basically means it wasn’t changed, so now you need to remember the 3 different orientations of regular p orbitals, how it could be x, y, or z. The x, y, and z are 90* different between each other. Here is a link to the original p orbitals.

https://i.stack.imgur.com/nC2Zh.png