Chemistry Electron Configuration Solution: All of the following electronic configurations are...

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Solution: All of the following electronic configurations are correct  except a) 20Ca  [Ar]4s2 b) 25Mn  [Ar] 3d54s2 c) 29Cu  [Ar] 3d104s1 d) 50Sn   [Kr]4d105s25p2 e) 86Rn  [Xe]5d106s26p6