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Terms Allowed in Spectroscopic Structure of Calcium

  1. Oct 15, 2016 #1
    1. The problem statement, all variables and given/known data
    Why can't we have 4s^2 3S1 calcium? I've looked up a table of terms and this is never given, so I guess we can't have it. Why can't the spins of each of the outer electrons add to give S = 1, J = 1, and a degeneracy of 3? I guess the answer must be pretty basic since nobody has asked about this that I can find, so what's going on?

    2. Relevant equations


    3. The attempt at a solution
     
  2. jcsd
  3. Oct 15, 2016 #2

    Charles Link

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    Homework Helper

    I think this one is simple: Two electrons in the same orbital implies S=0 because the spins must be opposite.
     
  4. Oct 16, 2016 #3
    Oh yeah, completely forgot about the PEP! Thanks for taking your time to answer my dumb question!
     
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