Which of the series written below is in order of increasing first ionization energy (atoms with the smallest ionization energy first)?

Question

Quizplus · Accepted Answer

The first ionization energy generally increases across a period and decreases down a group. In option C, Ca is in Group 2, S is in Group 16, and F is in Group 17, which follows the trend of increasing ionization energy across a period.

Which of the Series Written Below Is in Order of Increasing