A) \[2\]
B) \[3\]
C) \[4\]
D) \[7\]
Correct Answer: B
Solution :
\[Co\] (atomic number \[=27\]) \[={{1}^{2}},2{{s}^{2}}2{{p}^{6}},3{{s}^{2}}3{{p}^{6}}3{{d}^{7}},4{{s}^{2}}\]. Thus, number of unpaired electrons \[=3\]
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