An electron from of the M shell occupying a hole in the K shell at 69 keV expelled as you move from the outside in to the inside will be moving to an energy levels with an ionization energy of 70 keV -2 keV,
The minimal energy needed to ionize an atom is sufficient to eject an electron from its ground state. Ionization energy has a periodic trend that rises across the chemical elements form top to bottom as well as from left to right.
As you move from left to right along a period just on periodic table, the initial ionization energy often rises. This is because when nuclear charge rises, the outermost electron becomes more tightly connected to the nucleus.
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