Assertion (A): Copper (Z=29) with electronic configuration [Ar] 4s1 3d10is more stable than [Ar]s 2 3d9.Reason (R): Copper with [Ar] 4s1 3d10is more stable due to symmetrical distribution and exchange energies of 4 electrons.

Assertion (A): Copper (Z=29) with electronic configuration [Ar] 4s1 3d

1.	Assertion (A): Copper (Z=29) with electronic configuration [Ar] 4s1 3d10is more stable than [Ar]s 2 3d9.Reason (R): Copper with [Ar] 4s1 3d10is more stable due to symmetrical distribution and exchange energies of 4 electrons.
Answer» A and R are CORRECT and R is the correct EXPLANATION of A. A and R are correct but R is not the correct the explanation of A. A is correct but R is WRONG. A is wrong but R is correct. Answer :A