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Homework Help: Atomic structure and determing effective nuclear charge

  1. Oct 29, 2008 #1
    1. The problem statement, all variables and given/known data

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

    2. Relevant equations

    Zeffective = Z - S (not listed in text book, found this online when trying to figure out the problem)

    3. The attempt at a solution

    Nothing in the text book in this section talk about determining nuclear charge. I know that Na is in the 2s[tex]^{2}[/tex]2p[tex]^{6}[/tex] group.
  2. jcsd
  3. Oct 29, 2008 #2


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    For a hydrogenic atom, what is the expression for the energy-levels in terms of the principle quantum-number?
  4. Oct 29, 2008 #3
    I believe that would be 1s
  5. Oct 30, 2008 #4


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    no. you need an equation that relates energy "E" to the principle quantum number "n". Do you know an equation like that?
  6. Nov 8, 2008 #5
    I do now... Even though I read that response too late. The grader of my homework gave me full credit anyways for a sub-par result.... But I appreciate the response because it let me on the right track after the fact!
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