n and l numbers

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Brendan Duong 1I
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Joined: Wed Sep 30, 2020 10:07 pm

n and l numbers

Postby Brendan Duong 1I » Sat Oct 31, 2020 3:50 pm

So my understanding is (and correct me if I'm wrong) n is the number/coefficient in front of the orbital. So n for 7s^2 is 7. My main point of confusion is for the l number. I've written down from lecture that l is equal to 0,1, up to n-1. But Ive also seen others just say that l is just 0 for s orbital, 1 for p, 2 for d, and 3 for f. So which of the two is it? What is n and l for 7p^5?

Akash J 1J
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Re: n and l numbers

Postby Akash J 1J » Sat Oct 31, 2020 3:55 pm

For 7p5, n = 7, l = 1.

You are right, for the angular momentum number (l), l=0 indicates the s subshell, l=1 indicates the p subshell, etc. However if you look at n = 1 (the first period with H and He), p can only equal 0, showing that you can only have the s subshell when n=1.
When n = 2, you can have l = 0, 1 indicating that the s and p subshells are possible. The trend continues until the f subshell (l=3) because after f, we don't currently have subshells to be characterized by l=4, 5, 6...

MinjooPark_3I
Posts: 79
Joined: Wed Sep 30, 2020 9:33 pm

Re: n and l numbers

Postby MinjooPark_3I » Sat Oct 31, 2020 3:59 pm

Hii. So l represents the shape of an orbital or specific subshell. l=0 is s, l=1 is p, l=2 is d, and l=3 is f.

Sonel Raj 3I
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Re: n and l numbers

Postby Sonel Raj 3I » Sat Oct 31, 2020 4:43 pm

The thing that has helped me most when learning about orbitals is looking at their positions in the periodic table. N corresponds to the period number, and if we were, for example, to only look at n=1, we would see that there are only two elements, and therefore only one possible subshell. For n=2, there is the s-subshell and the p-subshell only. If you can understand how the quantum numbers fit into the periodic table (there should be more resources online!) it can help you understand conceptually. :)

Shruti Kulkarni 2I
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Joined: Thu Oct 08, 2020 12:16 am

Re: n and l numbers

Postby Shruti Kulkarni 2I » Sat Oct 31, 2020 4:46 pm

Hi! Generically, the corresponding orbitals do follow the pattern l = 0 is s, l = 1 is p, l = 2 is d, and l = 3 is f. So, for the 7p^5 example you mentioned, it would have quantum numbers of n = 7 and l = 1, as you are in the p-orbital.

Joey_Okumura_1E
Posts: 82
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Re: n and l numbers

Postby Joey_Okumura_1E » Sat Oct 31, 2020 5:31 pm

n represents the shell. l represents the subshell. ml represents the orbital. Therefore, for 7p5, n=7; l=1 indicates it is a p orbital; and ml would indicate if it was a px orbital, py orbital, etc.


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