Apentix/AP Chemistry/Unit 2: Molecular and Ionic Compound Structure and Properties/Question
AP Chemistrymediummcq1 pt

Bond length in diatomic molecules generally increases down a group (F₂ < Cl₂ < Br₂ < I₂). Why?

A.Atoms get larger down the group
B.Electronegativity increases down the group
C.Bond order increases down the group
D.Larger atoms share more electrons

Explanation

Core Concept

Bond length is roughly the sum of atomic radii plus the bonding overlap, so larger atoms give longer bonds. Iodine's big valence shell forces a longer I–I distance than F–F.

Correct Answer

AAtoms get larger down the group

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