---
title: "Particulate representations of two distinct alloys formed from the same host metal are shown below.  Which of the following correctly identifies the interstitial alloy and provides the best structural explanation for why it is harder and less malleable than the pure host metal?"
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url: "https://nerd-notes.com/ubq/121415/"
date_modified: "2026-08-23T05:02:09+00:00"
---

# Particulate representations of two distinct alloys formed from the same host metal are shown below.

Which of the following correctly identifies the interstitial alloy and provides the best structural explanation for why it is harder and less malleable than the pure host metal?

Particulate representations of two distinct alloys formed from the same host metal are shown below.

Which of the following correctly identifies the interstitial alloy and provides the best structural explanation for why it is harder and less malleable than the pure host metal?

![Two square containers shown side-by-side in grayscale. A legend at the top defines: large open circle = host metal atom, small solid black circle = solute atom with smaller radius, large shaded circle = solute atom with similar radius. The left box is labeled Alloy 1 and contains 12 large open circles in a regular 4-column by 3-row grid, with exactly 3 small solid black circles located in the interstitial spaces between the host atoms. The right box is labeled Alloy 2 and contains 12 large circles of identical size in a 4-column by 3-row grid, consisting of 9 large open circles and 3 large shaded circles occupying regular lattice positions. No other particles, labels, text, or annotations appear.](https://nerd-notes.com/wp-content/uploads/ubq-frq-generated/stem-fig-1-1787461329-6Cn24v.jpg)

- **A.** Alloy \(1\) is an interstitial alloy; the small solute atoms occupy the spaces between the host atoms, which disrupts the regular lattice and restricts the layers of atoms from sliding past one another under stress.
- **B.** Alloy \(1\) is an interstitial alloy; the small solute atoms form directional covalent bonds with the adjacent host atoms, converting the metallic structure into a rigid network solid.
- **C.** Alloy \(2\) is an interstitial alloy; the solute atoms substitute directly into lattice sites, which increases the total valence electron concentration and strengthens the metallic bonds.
- **D.** Alloy \(2\) is an interstitial alloy; the presence of solute atoms of comparable radius prevents the sea of delocalized electrons from conducting applied mechanical forces.

*The answer key and step-by-step explanation are available to logged-in users at https://nerd-notes.com/ubq/121415/*