Hund's Rule

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Mulin_Li_2J
Posts: 85
Joined: Sat Aug 17, 2019 12:16 am

Hund's Rule

Postby Mulin_Li_2J » Sun Oct 20, 2019 10:36 pm

I still don't understand why electrons will fill up empty orbitals first before getting into pairs. If Aufbau principle applies to this case, does it suggest that electrons in empty orbitals have lower energy than that in paired electrons?

chemboi
Posts: 72
Joined: Sat Jul 20, 2019 12:16 am

Re: Hund's Rule

Postby chemboi » Sun Oct 20, 2019 10:45 pm

I believe that single electrons parallel spins occupying empty orbitals is a lower energy (more favorable) than pairing first. I'm not 100% sure why pairing-first filling is not favorable, but I think it has to do with the involved electron-electron repulsion in such a scenario.

zoedfinch1K
Posts: 57
Joined: Thu Jul 25, 2019 12:16 am

Re: Hund's Rule

Postby zoedfinch1K » Sun Oct 20, 2019 10:48 pm

Paired electrons would have a electron-electron repulsion, so electron would naturally want to fill up space where there are fewer repulsions first, before having to be paired.

Michelle Xie 3A
Posts: 79
Joined: Sat Aug 17, 2019 12:18 am

Re: Hund's Rule

Postby Michelle Xie 3A » Sun Oct 20, 2019 11:17 pm

There are electron repulsions with paired electrons, therefore it is not favorable to have paired electrons before parallel ones.

Siya Shah 1J
Posts: 50
Joined: Sat Aug 17, 2019 12:15 am

Re: Hund's Rule

Postby Siya Shah 1J » Sun Oct 20, 2019 11:20 pm

The electrons cannot pair up first because they would repel one another, so the lowest energy scenario is if one electron fills up the orbitals first.

Isabella Dal Porto 1H
Posts: 80
Joined: Fri Aug 30, 2019 12:16 am

Re: Hund's Rule

Postby Isabella Dal Porto 1H » Sun Oct 20, 2019 11:22 pm

Hund's Rule states that electrons in the same subshell occupy different orbitals with a parallel spin because of the fact that there is less electron repulsion and the lowest amount of energy.


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