Chemistry

Question Analysis
This question involves applying the group trend to halogens to identify the element with the highest first ionization energy. The main focus is on using the top-to-bottom group trend for a specific element family.

Key Concept Explanation
First ionization energy decreases down a main group. The topmost element in a group has the smallest atomic radius and strongest hold on valence electrons, resulting in the highest ionization energy.

Step-by-Step Solution
1. Recall the group trend: ionization energy decreases down a group.
2. Identify the topmost element in Group 17 among the options (fluo...