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What is the electron configuration of a ground-state Cu atom? Select one:
A. 1s² 2s² 2p⁶ 3s² 3p⁶ 4s¹ 3d¹⁰
B. 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 4d⁹
C. 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d⁹
D. 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰
E. 1s² 2s² 2p⁶ 3s² 3p⁶ 4s¹ 4d¹⁰

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