A) \[1{{s}^{1}}\]
B) \[1{{s}^{2}},\,2{{s}^{2}}\,2{{p}^{6}}\]
C) \[1{{s}^{2}},\,2{{s}^{2}}\,2{{p}^{6}},\,3{{s}^{1}}\]
D) \[1{{s}^{2}},\,2{{s}^{2}}\,2{{p}^{2}}\]
Correct Answer: C
Solution :
\[1{{s}^{2}}2{{s}^{2}}2{{p}^{6}}3{{s}^{1}}\]. It belongs to IA group which has least ionization potential and it decreases down the group
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