A) \[Na,Mg\]
B) \[K,Ca\]
C) \[Rb,Sr\]
D) \[Cs,Ba\]
Correct Answer: A
Solution :
The ionisation energy increases on moving left to right in a period while on moving downward in a group, the ionisation energy decreases due to increase of atomic size. From the given pair the first element is from IA group and second element is from IIA group. The difference of ionisation energy of these element reduces on moving downward. Hence, the difference of first ionisation energy of Na and Mg is maximum.
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