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I Difference between binding energy and ionization energy

  1. Sep 7, 2017 #1


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    I wonder since some time why ionization energies are not equal to binding energies.

    For instance, take the case of aluminum in the following configuration [Ne]3s²3p

    Ionization energy ~ 6 eV
    Binding energy ~ 5 eV

    Where does this difference come from ?

    Thanks in advance
  2. jcsd
  3. Sep 7, 2017 #2


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    Staff: Mentor

    What is your source for these numbers (especially the binding energy)?
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