# Homework Help: Orbital/Spin angular momentum + magnetic quantum numbers

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1. Nov 22, 2017

### youngfreedman

1. The problem statement, all variables and given/known data
A single electron atom has the outer electron in a 4f1 excited state. Write down the orbital and spin angular momentum quantum numbers and the associated magnetic quantum numbers for this state.

2. Relevant equations
I don't think there is any relevant equations. I think it comes purely from the fact it's in a 4f1 excited state.

3. The attempt at a solution
I originally thought it was l=3 for the orbital angular momentum quantum number, as I read that's what it is for "f". However, I am thrown off by the fact it's 4f1.

Thank you.

2. Nov 23, 2017

The subscript "1" should be the $J$ value, but $J=1$ is not possible. I believe the 4 is the principal quantum number $n$. Meanwhile you can always say $s=1/2$. They are also asking what values $m_l$ and $m_s$ can have.