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For a, the question is asking for the configuration of Cu+. The normal configuration for Cu is [Ar]3d^104s^1. The + charge on Cu means you are taking off one electron, so you would take off the electron from the furthest shell from the nucleus. In this case, it would be from the s-block, which would leave you with [Ar]3d^10.
In order to decide which electrons are removed, I would write the ground-state electron configuration of the regular atom. Then I would remove electrons from the last orbital that has the highest energy level because it is the furthest away from the nucleus. I think this is where Dr. Lavelle's suggestion to write the electron configuration with the energy levels (n) being grouped together is helpful because it would help you see where the electrons would be removed/added.
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