A) \[C{{r}^{+3}}\]
B) \[{{V}^{+3}}\]
C) \[C{{o}^{+3}}\]
D) \[F{{e}^{+3}}\]
Correct Answer: D
Solution :
Fe (atomic number = 26) \[=1{{s}^{2}},2{{s}^{2}}2{{p}^{6}},3{{s}^{2}}3{{p}^{6}}3{{d}^{6}},4{{s}^{2}}\] \[F{{e}^{+3}}=1{{s}^{2}},2{{s}^{2}}2{{p}^{6}},3{{s}^{2}}3{{p}^{6}}3{{d}^{5}}\] Thus, \[F{{e}^{+3}}\] has highest magnetic moment since it has maximum number (5) of unpaired electrons.
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