Apentix/AP Chemistry/Unit 2: Molecular and Ionic Compound Structure and Properties/Question
AP Chemistryeasymcq1 pt

Striking an ionic crystal such as NaCl shifts one lattice layer sideways. Why does the crystal then fracture instead of denting?

A.Covalent bonds throughout the crystal snap under strain
B.Like-charged ions become nearest neighbors and repel until the plane splits apart
C.Ions evaporate from the surface under mechanical stress
D.Mobile electrons cushion the blow until the structure collapses

Explanation

Core Concept

Ionic lattices hold together only because unlike charges sit beside one another. Sliding a plane by one position places Na⁺ above Na⁺ and Cl⁻ above Cl⁻, converting stabilizing attractions into strong repulsions along that plane. With nothing holding the misaligned layers, the crystal cleaves rather than deforming the way metals do.

Correct Answer

BLike-charged ions become nearest neighbors and repel until the plane splits apart

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