Question

Assertion :The ground state electron configuration orbitals of elemental $Cu$ is $\left[Ar\right]4s^{1}3d^{10}$
Reason: Completely half-filled and filled d orbital best show special electronic stabilization

• A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
• B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
• C. Assertion is correct but Reason is incorrect
• D. Both Assertion and Reason are incorrect

Answer 1

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

One electron from $4s$ orbital jumps to $3d$ orbital to make it fully filled. So ${}_{29}Cu=\left[Ar\right]4s^{1}3d^{10}$