Chemistry

Question Analysis
This question involves applying group trends to compare ionization energies of specific elements. The main focus is on identifying the element with the highest IE in Group 17 and the underlying atomic structure reasons.

Key Concept Explanation
Down Group 17 (halogens), atomic radius increases, shielding effect strengthens, and IE decreases.
Fluorine is the topmost element in the group, so it has the smallest atomic radius, the least shielding of valence electrons, and the strongest nuclear attraction—resulting in the highest IE among F, Cl, and Br.

Step-by-Step Solution
1. Recall Group 17 IE trend: decreases from top to bottom (F > Cl > Br).
2. Identify the element with the ...