A) \[1{{s}^{2}},\,\,2{{s}^{2}}2{{p}^{2}},\,\,3{{s}^{2}}\]
B) \[1{{s}^{2}},\,\,2{{s}^{2}}\]
C) \[1{{s}^{2}},\,\,2{{s}^{2}}2{{p}^{6}}\]
D) None of these
Correct Answer: A
Solution :
Key Idea: Check all configurations on aufbau configuration. [a] \[1{{s}^{2}},\,\,2{{s}^{2}},\,\,2{{p}^{2}},\,\,3{{s}^{2}}\] is not possible because orbitals of lower energy level must be completely filled, before the orbital of higher energy level is filled. [b] \[1{{s}^{2}},\,\,2{{s}^{2}}\] is possible as it follows aufbau principle. [c] \[1{{s}^{2}},\,\,2{{s}^{2}},\,\,2{{p}^{6}}\] is possible as it follows aufbau principle
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