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1.

A. $[A r] 3 d^{5} 4 s^{1}$
B. $[A r] 3 d^{5} 4 s^{1}$
C. $[A r] 3 d^{5} 4 s^{1}$
D. $[A r] 3 d^{5} 4 s^{1}$

Answer: Option A

Explanation:

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