A) \[1{{s}^{1}}\]
B) \[1{{s}^{2}},\,2{{s}^{2}}{{p}^{6}}\]
C) \[1{{s}^{2}},\,2{{s}^{2}}{{p}^{2}}\]
D) \[1{{s}^{2}},\,2{{s}^{2}}{{p}^{6}},\,3{{s}^{1}}\]
Correct Answer: D
Solution :
Ionization potential is least for alkali metals and it decreases down the group.
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