Which of the following is the correct electron configuration for the Copper(II) ion, Cu²⁺ (Z=29)?

[Ar] 3d⁹ 4s²
[Ar] 3d¹⁰ 4s¹
[Ar] 3d⁹
[Ar] 3d⁸ 4s¹

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A neutral Copper atom is [Ar] 3d¹⁰ 4s¹. When forming a Cu²⁺ ion, electrons are removed from the 4s orbital first, then one from the 3d orbital. This leaves [Ar] 3d⁹.

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