Statement 1: The ground state electron configuration orbitals of elemental $C u$ is $[A r] 4 s^{1} 3 d^{10}$
Statements 2: Completely filled and half-filled $d -$ orbitals bestow special electronic stabilization.

Statement 1 and Statement 2 are correct and Statement 2 is the correct explanation of Statement 1.

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Both the Statement 1 and Statement 2 are correct, but Statement 2 is NOT the correct explanation of Statement 1.

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Statement 1 is correct, but Statement 2 is not correct.

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Statement 1 is not correct, but Statement 2 is correct.

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Solution

The correct option is A Statement 1 and Statement 2 are correct and Statement 2 is the correct explanation of Statement 1.
The electronic configuration of Cu is found to be $[A r] 4 s^{1} 3 d^{10}$ . This is an experimental observation. The reason for this is the completely filled and half filled sub shells provide extra stability to the atom. Hence correct option is A.

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Statement 1: The ground state electron configuration orbitals of elemental Cu is [Ar]4s13d10Statements 2: Completely filled and half-filled d−orbitals bestow special electronic stabilization.

Statement 1: The ground state electron configuration orbitals of elemental $C u$ is $[A r] 4 s^{1} 3 d^{10}$
Statements 2: Completely filled and half-filled $d -$ orbitals bestow special electronic stabilization.