A) 3
B) 4
C) 5
D) 2
Correct Answer: A
Solution :
\[_{27}Co\to [Ar]3{{d}^{7}}4{{s}^{2}}\] \[C{{o}^{2+}}\to 3{{d}^{7}}4{{s}^{0}}\] Number of unpaired electrons = 3.You need to login to perform this action.
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