A) \[1{{s}^{2}},\,2{{s}^{2}},\,2{{p}^{6}}\]
B) \[1{{s}^{2}},\,2{{s}^{2}},\,2{{p}^{6}},3{{s}^{1}}\]
C) \[1{{s}^{2}},\,2{{s}^{2}},\,2{{p}^{5}}\]
D) \[1s,\,2{{s}^{2}},\,2{{p}^{3}}\]
Correct Answer: B
Solution :
In the Periodic Table, the minimum ionisation energy is found at alkali metals. Hence sodium (electronic configuration \[=1{{s}^{2}}2{{s}^{2}}2{{p}^{6}}3{{s}^{1}}\]) has the lowest ionization energy. Note Ionisation energy is the amount, of energy required to remove an electron from the outermost shell an isolated atom.
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