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GK QUESTION#3160

The correct electronic configuration of Cu is:

  1. A[Ar]3d⁹4s²
  2. B[Kr]3d⁹4s²
  3. C[Kr]3d¹⁰4s¹
  4. D[Ar]3d¹⁰4s¹Correct answer
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Answer

D. [Ar]3d¹⁰4s¹

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Explanation

The ground-state configuration of neutral copper, atomic number 29, is [Ar]3d¹⁰4s¹. The filled 3d subshell is important to this configuration. A krypton core already contains 36 electrons and cannot represent neutral copper.

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