Problem: The first three ionization energies for Ba is given in the graph below.  Explain this trend in terms of the electronic configuration; in particular, discuss why the third ionization energy is almost 4 times higher than the second.

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The first three ionization energies for Ba is given in the graph below.  Explain this trend in terms of the electronic configuration; in particular, discuss why the third ionization energy is almost 4 times higher than the second.

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