1. Not finding help here? Sign up for a free 30min tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Total angular momentum quantum number

  1. Aug 23, 2008 #1
    lets say there is an electron configuraiton of [tex]1s^2 2s^2 2p^2 3p^1[/tex]

    I want to find the total angular momentum quantum number, J=L+S

    considering the n=1 state, there are two electrons, in the s shell which means one is spin 1/2 and the other is spin -1/2 giving a total spin of 0. The s shell has no angular momentum so L=0.

    considering n=2 state, there are two electrons in the s shell which again gives us 0 total angular momentum. If we went to the p shell, there are 2 electrons in the p shell, each having L=1, so we add them together to get L=2. The two electrons do not contribute spin since their net sum is zero, S=1/2-1/2=0.

    considering the n=3 state, there is 1 electron in the p shell, which means S=1/2 and L=1

    J is the sum of L and S, so the total angular momentum should be J=L+S=2+1+1/2=7/2

    Is this correct?
  2. jcsd
  3. Aug 24, 2008 #2
    any ideas?
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Similar Discussions: Total angular momentum quantum number
  1. Total Angular Momentum (Replies: 3)