A) \[1{{s}^{2}}2{{s}^{2}}2{{p}^{6}}\]
B) \[1{{s}^{2}}3{{p}^{3}}3{{s}^{2}}\]
C) \[1{{s}^{2}}3{{s}^{2}}3{{p}^{6}}\]
D) \[1{{s}^{2}}2{{s}^{2}}3{{s}^{2}}\]
Correct Answer: A
Solution :
According to Aufbau principle electron are filling increasing order of energy. Therefore the electronic configuration \[1{{s}^{2}}\,2{{s}^{2}}\,2{{p}^{6}}\] obeys Aufbau principle.
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