### Determining electrons

Posted:

**Fri Nov 02, 2018 4:42 pm**How do you find the possible number of electrons given by quantum numbers?

Ex: n=2, l= 1

n=4, l=0, ml=-2, ms= -1/2

Ex: n=2, l= 1

n=4, l=0, ml=-2, ms= -1/2

Created by Dr. Laurence Lavelle

https://lavelle.chem.ucla.edu/forum/

https://lavelle.chem.ucla.edu/forum/viewtopic.php?f=21&t=35502

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Posted: **Fri Nov 02, 2018 4:42 pm**

How do you find the possible number of electrons given by quantum numbers?

Ex: n=2, l= 1

n=4, l=0, ml=-2, ms= -1/2

Ex: n=2, l= 1

n=4, l=0, ml=-2, ms= -1/2

Posted: **Fri Nov 02, 2018 4:55 pm**

There are 2 electrons (up/down spin) per magnetic quantum.

So for example n=2 l=1

Ml = -1,0,1

so for each of these three there are 2 electrons. So in this case it's a total of 6 electrons.

For n=4 ... ms=-1/2

It is only 1 electron because they gave you all four quantum numbers and no 2 electrons in the same atom can have the exact same quantum numbers.

So for example n=2 l=1

Ml = -1,0,1

so for each of these three there are 2 electrons. So in this case it's a total of 6 electrons.

For n=4 ... ms=-1/2

It is only 1 electron because they gave you all four quantum numbers and no 2 electrons in the same atom can have the exact same quantum numbers.

Posted: **Sat Dec 08, 2018 12:33 pm**

You look at the number of orbitals in a given subshell and then multiply it by 2 since there are 2 electrons in each orbital

(so if l=2, there are 5 orbitals, meaning 10 electrons)

(so if l=2, there are 5 orbitals, meaning 10 electrons)

Posted: **Sat Dec 08, 2018 11:24 pm**

I find it easiest to think of it as shell, subshells, and orbitals.

Ex: n=2, l= 1

n = 2 means it is in the 2nd shell and l = 1 means it must be in the p orbital. There are 6 possible electrons in the 2p orbital.

Ex: n=2, l= 1

n = 2 means it is in the 2nd shell and l = 1 means it must be in the p orbital. There are 6 possible electrons in the 2p orbital.