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The e- config for K is [Ar]4s1 while for Sc^(2+) it is [Ar]3d1. This is because Sc normally is [Ar]3d1 4s2 but when you ionize this and take away 2 electrons you first have to ionize the 4s orbital and then, if necessary, the 3d orbital. This is because the 3d orbital becomes of less energy than the 4s orbital after it begins to fill with electrons.
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