A) \[~3{{d}^{8}}4{{s}^{2}}\]
B) \[~3{{d}^{7}}\text{ }4{{s}^{2}}\]
C) \[~3{{d}^{6}}4{{s}^{2}}\]
D) \[~3{{d}^{5}}4{{s}^{2}}\]
Correct Answer: C
Solution :
Key Idea: Electrons are filled, in orbitals according to aufbau rule. \[{{\,}_{26}}Fe=1{{s}^{2}},2{{s}^{2}},2{{p}^{6}},3{{s}^{2}},3{{p}^{6}},4{{s}^{2}},3{{d}^{6}}\]
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