---
title: "Particulate representations of two different alloys of metal \\(M\\) are shown below. Alloy 1 is composed of metal \\(M\\) and element \\(X\\), and Alloy 2 is composed of metal \\(M\\) and element \\(Y\\).  Which of the following correctly identifies the alloy type of Alloy 1 and provides a valid structural explanation for why Alloy 1 is less malleable than pure metal \\(M\\)?"
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url: "https://nerd-notes.com/ubq/119652/"
date_modified: "2026-08-21T08:11:56+00:00"
---

# Particulate representations of two different alloys of metal \(M\) are shown below. Alloy 1 is composed of metal \(M\) and element \(X\), and Alloy 2 is composed of metal \(M\) and element \(Y\).

Which of the following correctly identifies the alloy type of Alloy 1 and provides a valid structural explanation for why Alloy 1 is less malleable than pure metal \(M\)?

Particulate representations of two different alloys of metal \(M\) are shown below. Alloy 1 is composed of metal \(M\) and element \(X\), and Alloy 2 is composed of metal \(M\) and element \(Y\).

Which of the following correctly identifies the alloy type of Alloy 1 and provides a valid structural explanation for why Alloy 1 is less malleable than pure metal \(M\)?

![A legend at the top displays: a large open circle with a black outline represents an atom of metal \(M\), a small solid black circle represents an atom of element \(X\), and a large gray-shaded circle with a black outline represents an atom of element \(Y\). Below the legend are two identical side-by-side square containers labeled Alloy 1 on the left and Alloy 2 on the right. The left container for Alloy 1 contains a regular two-dimensional grid of exactly 12 large open circles arranged in 3 horizontal rows of 4 circles each, with exactly 3 small solid black circles situated in the interstitial spaces between the rows. The right container for Alloy 2 contains a regular two-dimensional grid of exactly 12 large circles of identical size to metal \(M\) arranged in 3 horizontal rows of 4 circles each, consisting of exactly 9 large open circles and exactly 3 large gray-shaded circles occupying standard lattice positions. No other particles, labels, text, or annotations appear.](https://nerd-notes.com/wp-content/uploads/ubq-frq-generated/stem-fig-1-1787299916-oaSWrs.jpg)

- **A.** Alloy 1 is a substitutional alloy because the solute atoms of \(X\) have substituted into lattice sites normally occupied by \(M\), disrupting the regular planes of atoms.
- **B.** Alloy 1 is an interstitial alloy because the smaller solute atoms of \(X\) occupy the voids between the larger atoms of \(M\), hindering the ability of atomic planes to slide past one another.
- **C.** Alloy 1 is a substitutional alloy because the atoms of \(X\) have a similar atomic radius to \(M\), which prevents the sea of delocalized electrons from conducting mechanical stress.
- **D.** Alloy 1 is an interstitial alloy because the atoms of \(X\) occupy the voids between the atoms of \(M\), increasing the free volume and allowing the atomic planes to slide past one another more easily.

*The answer key and step-by-step explanation are available to logged-in users at https://nerd-notes.com/ubq/119652/*