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Determining effective nuclear charge

  1. Feb 23, 2012 #1
    1. The problem statement, all variables and given/known data

    The 3s state Na has an energy of -5.14eV. Determine the effect nuclear charge.

    2. Relevant equations

    I believe you have to use:

    En=-[(13.6eV)Zeff^2]/n^2


    3. The attempt at a solution

    So since Na is in the 3s state, I think n=3. So:

    -5.14eV= -[(13.6eV)Zeff^2)]/9
    -46.3eV=(-13.6eV)Zeff^2
    Zeff=sqrt(3.40)=1.85

    However the answer in the back of the book is giving me 1.14e, could someone show me my mistake?
     
  2. jcsd
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