Hund's rule vs Pauli's

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405161024
Posts: 36
Joined: Fri Sep 28, 2018 12:25 am

Hund's rule vs Pauli's

Postby 405161024 » Tue Nov 20, 2018 1:16 pm

Could someone rephrase Hund's rule, and explain the difference between Hund's and Pauli's

Tam To 1B
Posts: 72
Joined: Fri Sep 28, 2018 12:25 am

Re: Hund's rule vs Pauli's

Postby Tam To 1B » Tue Nov 20, 2018 1:38 pm

Hund's rule states that one electron must fill each orbital first with a parallel spin before it can fill up with two electrons in each orbital with opposite spins.
For example, in a 2p orbital, one electron must fill each 2px1, 2py1, 2pz1, before another electron can fill those orbitals.
The Paul Exclusion Principle states that each orbital can only have electrons with opposite spins, which leads to stating that no electron has the same four quantum numbers.

Dayna Pham 1I
Posts: 98
Joined: Fri Sep 28, 2018 12:16 am
Been upvoted: 3 times

Re: Hund's rule vs Pauli's

Postby Dayna Pham 1I » Tue Nov 20, 2018 4:57 pm

Hello!
I like to associate Pauli with the word "pair" since they both start with P! That's just an extra thing that helps me remember that Pauli Exclusion Principle is about how electrons that are spin paired must be of opposite spin.

Hope this helped!

Megan Gianna Uy 3L
Posts: 30
Joined: Fri Sep 28, 2018 12:26 am

Re: Hund's rule vs Pauli's

Postby Megan Gianna Uy 3L » Tue Nov 20, 2018 5:16 pm

Pauli exclusion principle:
1. no more than 2e- per orbital
2. if two electrons are in the same orbital then spin paired

Hund's Rule:
1. due to electron repulsion electrons in the same shell occupy different orbitals
2. with parallel spin


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