Easy
The electronic configuration of $Cu$ is
- A$[Ne] 3s^{2}, 3p^{6}, 3d^{9}, 4s^{2}$
- B$[Ar] 3d^{10}, 4s^{1}$
- C$[Ne] 3s^{2}, 3p^{6}, 3d^{3}, 4s^{2}, 4p^{6}$
- D$[Ne] 3s^{2}, 3p^{6}, 3d^{5}, 4s^{2}, 4p^{4}$
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