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The atomic number refers to the number of protons within an atom's nucleus and defines which element the atom is. And an ion is an atom with some level of positive or negative charge as a result of losing or gaining electrons, so ionisation has no effect on the atomic number (an ion of copper is still copper) and a negligable effect on the Atomic Mass - since electrons are relatively very light.

The only way the atomic number can change is through nuclear fission (elements decaying into isotopes and lower elements) or nuclear fusion (creating higher elements).

As such this question makes no sense.

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