Of the following choices which electron configuration(s) (in its ground state) is (are) not possible? Answer(s): _______________ a. 1s2 2s2 2p3 b. [Ne] 3s2 3p8 c. [Kr] 5s2 4d10 5p2 d. [Ar] 4s2 3d7 e. All choices are possible

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