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1. $C O$

A. $4 d^{7} 5 s^{2} {এবং 4d}^{7} {5s}^{0}$
B. $4 d^{7} 5 s^{2} {এবং 4d}^{7} {5s}^{0}$
C. $4 d^{7} 5 s^{2} {এবং 4d}^{7} {5s}^{0}$
D. $4 d^{7} 5 s^{2} {এবং 4d}^{7} {5s}^{0}$

Answer: Option D

Explanation:

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