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Homework Help: Energy of an electron in hydrogen!

  1. Oct 24, 2012 #1
    What is the energy of an electron in the 2s orbital of a hydrogen atom?

    I thought En = -RZ^2 / n^2

    Why am i not getting the right answer with

    Z = 1
    n = 2
    and R just the value of the constant
  2. jcsd
  3. Oct 25, 2012 #2


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    Gold Member

    [tex] E = -13.6 \frac{z^2}{n^2}eV[/tex]
  4. Oct 25, 2012 #3


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    Staff Emeritus
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    Homework Helper

    If you don't tell us what answer you got, it is difficult to say why it is wrong.
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