A) \[H\]
B) \[He\]
C) \[Xe\]
D) \[Li\]
Correct Answer: D
Solution :
Ionization energy increases, as we move left to right across a period (i.e., from \[Li\] to \[Ne\]) and decreases when from top to bottom in a group. Hence, ionization energy of lithium \[(Li)\] is lowest in the given elements.
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