Chemistry

Question Analysis
This question involves identifying the least electronegative element within Group 17 (halogens). The main focus is on applying the group trend of electronegativity to a specific family of nonmetals.

Key Concept Explanation
Electronegativity decreases down a group in the periodic table. For halogens, this trend is caused by increasing atomic radius and shielding effect—valence electrons are farther from the nucleus, so the atom’s ability to attract bonding electrons weakens.

Step-by-Step Solution
1. List the halogens in order of their position in Group 17 (top to bottom): F (Period 2) → Cl (Period 3) → Br (Period 4) → I (Period 5)
2. Apply the group...