So I was asked to find the condensed electron configuration for Y3+. Now obviously I know that the standard condensed for Y is [Kr] 5s2 4d1. Since you're supposed to subtract 3 (starting from s and moving to d) I get [Kr] 5s0 4d0, or just [Kr]. Neither of these answers work, and I was wondering why. Thanks!

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So I was asked to find the condensed electron configuration for Y3+. Now obviously I know that the standard condensed for Y is [Kr] 5s2 4d1. Since you're supposed to subtract 3 (starting from s and moving to d) I get [Kr] 5s0 4d0, or just [Kr]. Neither of these answers work, and I was wondering why.