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Ionization energy is the periodic property of an element. The copper atom has the highest ionization energy among gold and silver atom.
Ionization energy is the amount of energy required for the removal of the loosely bounded electron from an atom. The ionization energy can be first, second, and third based on the number of electrons.
Ionization energy down the group decreases from top to bottom as the atomic radii of the element increase. So, the ionization energy for the given elements is Cu > Au > Ag.
Therefore, copper has the highest ionization energy.
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