Chemistry

Question Analysis
This question tests the understanding of periodic trends in ionization energy, specifically how it changes down a group.

Key Concept Explanation
Ionization energy generally decreases down a group due to the increasing atomic radius, which weakens the attraction for valence electrons.

Step-by-step Solution
1. Identify the elements given: Fluorine (F), Chlorine (Cl), Bromine (Br), and Iodine (I).
2. Determine their positions in the periodic table: F (top), Cl, Br, I (bottom).
3. Apply the trend: Ionization energy decreases down a group due to the increasing atomic radius....