1.

Which of the following configurations represents atoms of the elements having the highest second ionization energy [Pb. PMT 1998]

A. \[1{{s}^{2}}2{{s}^{2}}2{{p}^{4}}\]
B. \[1{{s}^{2}}2{{s}^{2}}2{{p}^{6}}\]
C. \[1{{s}^{2}}2{{s}^{2}}2{{p}^{6}}3{{s}^{1}}\]
D. \[1{{s}^{2}}2{{s}^{2}}2{{p}^{6}}3{{s}^{2}}\]
Answer» D. \[1{{s}^{2}}2{{s}^{2}}2{{p}^{6}}3{{s}^{2}}\]


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