Energy Gap between sp3 and p

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

Ian_Lee_1E
Posts: 109
Joined: Wed Sep 30, 2020 9:31 pm

Energy Gap between sp3 and p

Hello

As professor was giving an example using Ethene, professor said "energy gap is small between hybridized and normal p orbital, so you do not spin pair.:

What does that mean?

I understand that since sp2 is a mix between s and p orbitals, it is going to be closer to the p orbital. But I do not get why since it is closer, it means it will get an electron in its orbital rather than sp2 getting a pair for its first orbital.

Janelle Gokim 3B
Posts: 110
Joined: Wed Sep 30, 2020 9:42 pm
Been upvoted: 3 times

Re: Energy Gap between sp3 and p

Since they are closer in energy you can also say they are closer in proximity, meaning there is more electron electron repulsion. Therefore, it is more favorable to have that electron occupy the p orbital rather than spin pairing with one of the electrons in the hybridized orbitals.

Samantha Pedersen 2K
Posts: 121
Joined: Wed Sep 18, 2019 12:21 am
Been upvoted: 9 times

Re: Energy Gap between sp3 and p

Remember that electrons always want to be in the lowest energy state. Spin pairing in the hybridized orbital causes electron-electron repulsion which is a high energy, unfavorable state. Putting the last electron in the unhybridized orbital by itself is a lower energy state that is more favorable. I hope this helps!