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Assertion (A): Copper (Z = 29) with electronic configuration [Ar] 4s1 3d10 is more stable than [Ar] 4s1 3d10

Reason(R): Copper with [Ar] 4s2 3d9 is more stable due to symmetrical distribution and exchange energies of d electrons. 

(a) A and R are correct and R is the correct explanation of A. 

(b) A and R are correct but R is not the correct explanation of A. 

(c) A is correct but R is wrong. (d) A is wrong but R is correct.

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(a) A and R are correct and R is the correct explanation of A

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