## Hund's rule and Pauli Exclusion Principle

Katherine Chhen 3I
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Joined: Fri Sep 28, 2018 12:15 am

### Hund's rule and Pauli Exclusion Principle

What is the relationship between Hund's rule and the Pauli Exclusion principle?

Andrew F 2L
Posts: 103
Joined: Sat Aug 17, 2019 12:17 am

### Re: Hund's rule and Pauli Exclusion Principle

I think in class he just meant that due to e- repulsion, e- in same sub-shell occupy diff orbitals with parallel spin so they have the same spin i believe.
And for the Pauli exclusion principle rule He said that there can be no more than 2 e- per orbital and if there are 2e- in the same orbital, then they are opposite spin.
Sorry I'm not entirely sure about the relationship between them because I'm still trying to work it out myself!

ahuang
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Joined: Fri Aug 30, 2019 12:17 am
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### Re: Hund's rule and Pauli Exclusion Principle

Pauli Exclusion Principle simply states that in each orbital there are two electrons with opposite spin. Hund's rule states that each orbital should be filled up once before the second electron is added. It's also known as "the bus seat rule". On a bus, you want to maximize the seating so each person sits alone first. Only once all the seats are filled by one person, would you start doubling up seating.

Posts: 103
Joined: Sat Aug 17, 2019 12:18 am

### Re: Hund's rule and Pauli Exclusion Principle

We apply both Pauli Exclusion Principle and Hund's Rule to obtain the ground state electron configuration.

Alexandra Bartolome 2H
Posts: 102
Joined: Sat Jul 20, 2019 12:17 am

### Re: Hund's rule and Pauli Exclusion Principle

Both are used to determine ground state electron configuration. With the Pauli Exclusion Principle, electrons in the same orbital must have different spins. With Hund's rule, electrons must occupy different orbitals singularly, with the same spin before doubling up.

Kendra Barreras 3E
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Joined: Mon Sep 23, 2019 12:16 am

### Re: Hund's rule and Pauli Exclusion Principle

Both are used together to find the correct ground state electron configuration. The Pauli Exclusion principle just tells you that in one individual level your electron direction has to be opposite of each other (have different spins). Hund's says you have to fill up every level before attempting to put more than one electron in each level.

IScarvie 1E
Posts: 66
Joined: Sat Aug 17, 2019 12:16 am

### Re: Hund's rule and Pauli Exclusion Principle

You use Hund's rule and the Pauli Exclusion Principle together to write the ground-state electron configuration of an atom. Hund's rule tells you to fill in orbitals with one electron each with parallel spin before doubling up, and the Pauli Exclusion Principle tells you to give the paired electrons opposite spin when you run out of separate orbitals

Rhea Shah 2F
Posts: 97
Joined: Thu Jul 25, 2019 12:17 am

### Re: Hund's rule and Pauli Exclusion Principle

Hund's rule and the Pauli Exclusion principle combine to form the building up principle. Hund's rule states that electron with parallel sping must be added to each available orbital in the subshell before pairing the electrons together. The Pauli Exclusion principle states that each orbital may only have 2 electrons, and that each electron in an atom has its own unique set of four numbers.

AronCainBayot2K
Posts: 101
Joined: Fri Aug 30, 2019 12:17 am

### Re: Hund's rule and Pauli Exclusion Principle

Hund's Rule and Pauli Exclusion Principle share a relationship in which both relate to the building-up principle. Hund's Rule states that electrons in same subshell disperse through different orbitals with the same spins (parallel), where as Pauli Exclusion Principle allows a maximum of two electrons per orbital, in which they are paired with having an opposite spin. These applied, give the lowest energy electron configuration.

Maika Ngoie 1B
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Joined: Fri Aug 02, 2019 12:16 am

### Re: Hund's rule and Pauli Exclusion Principle

The relationship between the two lies with the fact that we use both Hund's Rule and the Pauli Exclusion Principle in conjunction with the Building-Up principle in order to properly create/write experimentally observed electron configurations.

AmyL_3L
Posts: 50
Joined: Fri Aug 09, 2019 12:17 am

### Re: Hund's rule and Pauli Exclusion Principle

Hund's Rule and Pauli Exclusion Principle are both used to determine electron configurations. To be more specific, Hund's Rule requires that electrons need to occupy an orbital once before pairing up in the same orbital. For Pauli Exclusion Principle, no two electrons in the same orbital can have the exact same four quantum numbers. Therefore, they must have opposing spins.

Cavalli_1H
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### Re: Hund's rule and Pauli Exclusion Principle

they are both guidelines that help to figure out electron configurations. you use both to obtain ground state e- configuration

Tahlia Mullins
Posts: 105
Joined: Thu Jul 25, 2019 12:15 am

### Re: Hund's rule and Pauli Exclusion Principle

Both Hund's Rule and Pauli Exclusion Principle provide the guidelines of the ground state electron configuration for a given atom. Singularly, Hund's Rule provides that each orbital must include one arrow before doubling up. The Pauli Exclusion Principle states that two electrons in the same orbital should have opposite spin. Therefore, when performing the electron configuration, write upward facing arrows in each orbital, then double up with downward facing arrows as needed.

Sreyes_1C
Posts: 90
Joined: Fri Sep 28, 2018 12:19 am

### Re: Hund's rule and Pauli Exclusion Principle

the relationship would be that they are both necessary in understanding how filling up the orbitals works. You can start by using Hund's rule to make sure each orbital has an electron before doubling up. Then, you can use Pauli's principle to arrange it so each orbital has one up and one down.

MeeraBhagat
Posts: 95
Joined: Sat Aug 24, 2019 12:15 am

### Re: Hund's rule and Pauli Exclusion Principle

They both relate to the properties of each energy subshell. Each subshell can only hold 2 electrons, according to the Pauli Exclusion Principle. The two electrons in that subshell must have opposite spins as to maximize stability, according to Hund's Rule.