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NEETChemistryStructure of Atom

The electronic configuration of the valence shell of Cu is 3d¹⁰4s¹ and not 3d⁹4s². How is this configuration explained?

Options

  1. AThe extra stability gained by having a half-filled d-subshell (4d¹⁰) and a filled s-subshell (4s¹) outweighs t
  2. BThe extra stability gained by having a half-filled d-subshell (3d¹⁰) and a filled s-subshell (4s¹) outweighs t
  3. CThe extra stability gained by having a half-filled d-subshell (3d 9 ) and a filled s-subshell (4s¹) outweighs
  4. DThe extra stability gained by having a half-filled d-subshell (3d¹⁰) and a filled s-subshell (4s¹) outweighs t

Correct answer

D. The extra stability gained by having a half-filled d-subshell (3d¹⁰) and a filled s-subshell (4s¹) outweighs t

Step-by-step solution

Correct Option is : (D) The extra stability gained by having a half-filled d-subshell (3d¹⁰) and a filled s-subshell (4s¹) outweighs the energy required to promote an electron from 4s to 3d. This leads to the observed configuration.

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