A) \[3{{d}^{8}}4{{s}^{2}}\]
B) \[3{{d}^{7}}4{{s}^{2}}\]
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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