In the cubic closest-packed structure of sodium chloride, which ions are touching or nearly touching?
I.Sodium ions and sodium ions
II.Chloride ions and chloride ions
III.Sodium ions and chloride ions
A) I only
B) II only
C) III only
D) II and III only
E) I and III only

Question

Quizplus · Accepted Answer

In the cubic closest-packed structure of sodium chloride, the sodium and chloride ions are arranged in a face-centered cubic array. This means that each ion is surrounded by six ions of the opposite type, and the ions that are touching or nearly touching are the sodium and chloride ions. Therefore, the answer is II and III only, as these are the ions that are closest together in the structure.

In the Cubic Closest-Packed Structure of Sodium Chloride, Which Ions