A) \[1{{s}^{2,}}2{{s}^{2}}2{{p}^{4}}\]
B) \[1{{s}^{2}},2{{s}^{2}}2{{p}^{6}},3{{s}^{2}}\]
C) \[1{{s}^{2}},2{{s}^{2}}2{{p}^{6}},3{{s}^{1}}\]
D) \[1{{s}^{2}},2{{s}^{2}}2{{p}^{6}},3{{s}^{2}}3{{p}^{1}}\]
Correct Answer: C
Solution :
Alkali metals after losing one electron acquire noble gas configuration, from which very high energy is required to remove the second electron thus have highest second ionisation energy.
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