What is the electron configuration of Cu²⁺?
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1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d⁷
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1s² 2s² 2p⁶ 3s² 3p⁶ 3d⁹
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1s² 2s² 2p⁶ 3s² 3p⁶ 4s¹ 3d⁸
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1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰
📝 Detailed explanation
Neutral copper is [Ar] 4s¹ 3d¹⁰. When forming Cu²⁺, electrons are removed first from the 4s orbital and then from the 3d orbital, giving [Ar] 3d⁹.
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