A) Lithium and sodium
B) Sodium and potassium
C) Potassium and calcium
D) Oxygen and chlorine
Correct Answer: C
Solution :
\[{{K}^{+}}\] and \[C{{a}^{++}}\] have the same electronic configuration \[(1{{s}^{2}},\,2{{s}^{2}}\,2{{p}^{6}},\,3{{s}^{2}}3{{p}^{6}})\]
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