Which of the following has the highest ionization energy? a. F or I
b. Fr or C
c. Ne or Bi
d. Kor Kr
e. Ar or Mg

helium

The first ionization energy varies in a predictable way across the periodic table. The ionization energy decreases from top to bottom in groups, and increases from left to right across a period. Thus, helium has the largest first ionization energy, while francium has one of the lowest.

Explanation:

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