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Ag has the electron configuration has [Kr] 4d10 5s1 when you take one electron out of the shell it comes from the highest energy which is 5s shell and it is also more stable to have the full d shell than a full s shell.
I think Ag is like an exception, where you remove one electron from the s orbital and it makes the d orbital full, so d10. Cu (copper) and Cr (chromium) follow the same pattern. So, Ag+ is originally [Kr] 5s24d9, but you remove one from 5s2 to make the 4d orbital full, so it becomes 5s1 4d10 and then a positive charge means removing one electron and it's easier to just remove the one from the 5s orbital so it becomes [Kr] 4d10.
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