Answer
See the explanation
Work Step by Step
Arrange the atoms in order of increasing first ionization energy:
a. \( \mathrm{S} >\mathrm{Se} > \mathrm{Te} \)
b. \( \mathrm{K} < \mathrm{Ni} < \mathrm{Br} \)
c. \( \mathrm{Ba} < \mathrm{Si} < \mathrm{F} \)
The first ionization energy generally increases from left to right across a period and decreases from top to bottom within a group. Therefore, the correct order of increasing first ionization energy for each group of atoms is as listed above.
