A) \[1{{s}^{2}},\text{ }2{{s}^{2}}2{{p}^{6}},\text{ }3{{s}^{2}}3{{p}^{6}}3{{d}^{5}}\]
B) \[1{{s}^{2}},\text{ }2{{s}^{2}}2{{p}^{6}},\text{ }3{{s}^{2}}3{{p}^{6}},\text{ }4{{s}^{2}}3{{d}^{5}}\]
C) \[1{{s}^{2}},\text{ }2{{s}^{2}}2{{p}^{6}},\text{ }3{{s}^{2}}3{{p}^{6}},\text{ }4{{s}^{2}}3{{d}^{7}}\]
D) \[1{{s}^{2}},\text{ }2{{s}^{2}}2{{p}^{6}},\text{ }3{{s}^{2}}3{{p}^{6}},\text{ }3{{d}^{6}},\text{ }4{{s}^{2}}\]
Correct Answer: D
Solution :
Firstly the electrons are filled in increasing order of energy as per Aufbau's principle and then rearrange the sub-shells in increasing order as: \[_{26}Fe=1{{s}^{2}},2{{s}^{2}}2{{p}^{6}},3{{s}^{2}}3{{p}^{6}}3{{d}^{6}},4{{s}^{2}}\]
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