Determining Quantum Numbers

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IsabelMurillo3K
Posts: 60
Joined: Wed Sep 30, 2020 9:51 pm

Determining Quantum Numbers

Postby IsabelMurillo3K » Sun Nov 01, 2020 7:41 pm

On Sapling, there are a couple questions regarding determining the number of electrons an atom could hold. For example, one question gives us the conditions of when n=7, l=1, and m=-1. I was wondering how I would go figuring out this problem? Thanks in advance!

Astha Patel 2J
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Joined: Wed Sep 30, 2020 10:03 pm
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Re: Determining Quantum Numbers

Postby Astha Patel 2J » Sun Nov 01, 2020 8:24 pm

So the first three quantum numbers specify an orbital. Each orbital can hold a maximum of 2 electrons. So the first three quantum numbers can specify at most 2 electrons. Once the fourth quantum number is given, then the four numbers specify a single electron.
Hope this helps :)

Kelly Tran 1J
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Re: Determining Quantum Numbers

Postby Kelly Tran 1J » Sun Nov 01, 2020 8:30 pm

I agree with Astha! The first 3 quantum numbers (n, l, and ml) can be the same for 2 electrons.

Eva Becker
Posts: 54
Joined: Wed Sep 30, 2020 9:40 pm

Re: Determining Quantum Numbers

Postby Eva Becker » Sun Nov 01, 2020 8:33 pm

n refers to the total number of orbitals (i think).

for the s subshell: l=0
p subshell: l=1
d: l=2

ml is the negative value of l to the positive value (i.e. if l=2, ml=-2, -1, 0, 1, 2)

Ellison Gonzales 1H
Posts: 64
Joined: Wed Sep 30, 2020 10:00 pm

Re: Determining Quantum Numbers

Postby Ellison Gonzales 1H » Sun Nov 01, 2020 11:26 pm

I know how to get the answer of ml from l, but what does ml stand for conceptually? I believe in the lecture he said that ml is the allowed values, but I don’t completely understand what that means. Thank you

Manseej Khatri 2B
Posts: 55
Joined: Wed Sep 30, 2020 9:42 pm

Re: Determining Quantum Numbers

Postby Manseej Khatri 2B » Sun Nov 01, 2020 11:38 pm

Hi. The ml quantum number is the orientation of the orbital. For example in the 2p subshell, you can have the individual orbitals oriented 2px, 2py, 2pz. With l being angular momentum, ml essentially is the orientation of the angular momentum.


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