The condensed electron configuration for a copper atom is:
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1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d⁹
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1s² 2s² 2p⁶ 3s² 3p⁶ 4s¹ 3d¹
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[Ar] 4s² 3d⁹
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[Ar] 4s¹ 3d¹⁰
📝 Detailed explanation
Copper has the stable electron configuration [Ar] 4s¹ 3d¹⁰ due to the completely filled 3d subshell.
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