A) \[Na\]
B) \[Mg\]
C) \[Al\]
D) None of these
Correct Answer: B
Solution :
Ionization potential increases from left to right in period. Exception -Ist ionization potential of group \[IIA\] elements is higher than 1st ionization potential of group \[III\,A\] elements. Elements \[Na\] \[Mg\] \[Al\] Group \[IA\] \[IIA\] \[IIIA\] So, \[Mg\] has highest 1st ionization potential.
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