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Write electronic configuration of Cu metal (Z=29) and Cr^3+ ion.

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Cu atom contains 29 electrons Cu = 1s²2s²2p⁶3s²3p⁵3d¹⁰

Cu atom contains 26 electrons Cu³⁺ = 1s²2s²2p⁶3s²3p⁶3d⁶

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