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I believe that the reason Silver is [Kr]4d^10 5s^1 is the same reason why Copper is an exception. The atom is more stable if the d orbital is completely full rather than partially full. Therefore one e- from the 5s orbital is "moved" into the 4d orbital.
Jessica is right - there are more exceptions than Cr and Cu, but those are the only two we learned about. Having 5 or 10 electrons in the d orbital is more stable than having 4 or 9, so any d-block element that ends up with 4 or 9 electrons in the d orbital will actually have 5 or 10 (and then just one in the subsequent s orbital).
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