A) \[Fe\]
B) \[Cr\]
C) \[Ti\]
D) \[V\]
Correct Answer: B
Solution :
Electronic configuration of given element is as follows \[_{26}Fe-1{{s}^{2}},2{{s}^{2}},2{{p}^{6}},3{{s}^{2}}3{{p}^{6}},4{{s}^{2}},3{{d}^{6}}\] \[\therefore \] Number of unpaired electrons = 4 \[_{24}Cr-1{{s}^{2}},2{{s}^{2}},2{{p}^{6}},3{{s}^{2}},3{{p}^{6}},4{{s}^{1}}3{{d}^{5}}\] \[\therefore \]Number of unpaired electrons = 6 \[_{22}Ti-1{{s}^{2}},2{{s}^{2}},2{{p}^{6}},3{{s}^{2}},3{{p}^{6}},4{{s}^{2}},3{{d}^{2}}\] \[\therefore \]Number of unpaired electrons = 2 \[_{23}V-1{{s}^{2}},2{{s}^{2}},2{{p}^{6}},3{{s}^{2}},3{{p}^{6}},4{{s}^{2}},3{{d}^{3}}\] \[\therefore \]Number of unpaired electrons = 3
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