Which of the following electronic configurations does not represent an alkali earth metal? A. 1s², 2s², 2p⁶, 3s²

B. 1s², 2s², 2p⁶, 3s², 3p⁶, 3d¹⁰, 4s², 4p⁶, 4d¹, 5s2

C.1s², 2s², 2p⁶, 3s², 3p⁶, 3d¹⁰, 4s2

D. 1s², 2s², 2p⁶, 3s², 3p⁶, 3d¹⁰, 4s², 4p⁶, 5s²

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