Pauli Exclusion Principle vs. Hund's Rule

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Olivia Young 1A
Posts: 60
Joined: Fri Sep 28, 2018 12:24 am

Pauli Exclusion Principle vs. Hund's Rule

Postby Olivia Young 1A » Wed Oct 24, 2018 11:34 am

What is the difference between the Pauli Exclusion Principle and Hund's Rule? I was confused as to how these two rules affect the electron configuration of atoms and if we need to include these rules when writing out electron configurations. Thanks!

Artin Allahverdian 2H
Posts: 76
Joined: Fri Sep 28, 2018 12:26 am

Re: Pauli Exclusion Principle vs. Hund's Rule

Postby Artin Allahverdian 2H » Wed Oct 24, 2018 11:53 am

The Pauli Exclusion Principle states that there can be no more than 2 electrons per orbital. For an orbital that has the full amount of 2 electrons, they must be spin paired, meaning one spins up while the other spins down.

Hunds rules states that electrons in the same sub shell occupy different orbitals until each orbital has at least one electron first before going on to filling up for the second. We don’t want one orbital to be filled and another to be completely empty because that is not energetically favorable nor stable.

Matthew Tran 1H
Posts: 165
Joined: Fri Sep 28, 2018 12:16 am

Re: Pauli Exclusion Principle vs. Hund's Rule

Postby Matthew Tran 1H » Wed Oct 24, 2018 5:08 pm

Hund's rule also says that orbitals with single electrons have the same spin on their electrons ie all spin up or all spin down.


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