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Which of the following electron configurations is NOT a permissible ground state orexcited state electron configuration for a period 4 transition metal? a.[Ar] 4s2 3d10 4p2 b. [Ar] 4s1 3d5 c.[Ar] 4s1 3d9 4p1 d. [Ar] 4s2 5s1 e.Two of the above are not possible