Posted by **Hero** on Tuesday, February 7, 2012 at 10:24am.

The following combinations of quantam numbers are not allowerd

1. n=3 l=0 m=-1

2. n=4 l=4 m=0

Can someone explain to me why the second one is not allowed.

Also check my explaination for the first one.

If L=0 then m also has to also =0

The s subshell (ℓ = 0) contains only one orbital, and therefore the mℓ of an electron in an s subshell will always be 0.

- Physics/Chemistry -
**drwls**, Tuesday, February 7, 2012 at 11:01am
The l (orbital angular momentum) quantum number cannot exceed n-1.

Your explanation for to the first "no" is correct.

- Physics/Chemistry -
**Hero**, Tuesday, February 7, 2012 at 11:05am
And what about the second one, can you explain that to me?

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