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Ag is one of the exceptions where the 4d orbital will actually take an e- from the 5s. therefore, the ground state of Ag would be [Kr]4d^10 5s^1. Because in this case Ag is an ion in the form Ag^+, we remove an electron from the 5s orbital, leaving [Kr]4d^10.
The normal ground state configuration for Ag is [Kr]4d^10 5s^1. Based off of the Aufbau principle, silver's expected configuration would be [Kr]4d^9 5s^2, but since a full or half-full subshell is more stable than a partially-filled one, the s electron is transferred to the d orbital since having the full 4d subshell and partially-filled 5s subshell is a more stable configuration than having partially-filled 4d and 5s subshells. Using the configuration [Kr]4d^10 5s^1 for silver, the 5s valence electron is lost so that the final ground state configuration for Ag+ is [Kr] 4d^10.
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