Question: When the electron becomes free electron ( no longer bound to the parent nucleus ) , the energy of free electron must be zero or

When the electron becomes free electron (no longer bound to the parent nucleus), the energy of free electron must be zero or positive, therefore, in order to free the electron at 3rd level, the least energy needed is:
0eV-(-16.6eV)=+16.6eV, i.e. the ionization energy of Na is +16.6eV.
When the electron becomes free electron ( no

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