Question

which of the following particulate - level diagrams best represents an interstitial alloy?

Explanation:

An interstitial alloy has smaller atoms occupying the holes (interstices) between the larger host - metal atoms. In diagram A, there are small atoms in the spaces between the larger atoms, which is characteristic of an interstitial alloy. Diagram B shows a substitutional alloy where atoms of similar size replace each other. Diagram C appears to represent an ionic compound with charged ions.

Answer:

A.