A) \[1{{s}^{2}},2{{s}^{2}}\]
B) \[1{{s}^{2}},2{{s}^{2}}2{{p}^{6}}\]
C) \[[Ar]\,3{{d}^{10}},4{{s}^{2}}4{{p}^{2}}\]
D) \[1{{s}^{2}},2{{s}^{2}}2{{p}^{2}},3{{s}^{1}}\]
Correct Answer: D
Solution :
We know from the Aufbau principle, that \[2p-\] orbital will be filled before 3s orbital. Therefore, the electronic configuration \[(1{{s}^{2}},2{{s}^{2}}2{{p}^{2}},3{{s}^{1}})\] is not possible.
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