A) Third
B) Second
C) First
D) Fourth
Correct Answer: A
Solution :
[a] \[Ca=3{{s}^{2}}3{{p}^{6}}4{{s}^{2}}\] \[C{{a}^{2+}}=3{{s}^{2}}3{{p}^{6}}4{{s}^{0}}\] (Stable noble gas configuration) Hence, there would be sudden increase in\[I{{E}_{3}}\] value.
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