Which of the following best describes an interstitial alloy?

• A. A homogeneous mixture of metals with similar atomic sizes.
• B. A mixture in which small atoms occupy spaces between the larger metal atoms in a crystal lattice.
• C. A compound formed by the chemical reaction of two metals.
• D. A solution in which nonmetal atoms replace metal atoms in the lattice.

Answer: (B)

Verified step by step guidance

1. Understand the definition of an interstitial alloy: it is a type of alloy where smaller atoms fit into the spaces (interstices) between the larger metal atoms in the crystal lattice.
2. Recall that in an interstitial alloy, the smaller atoms do not replace the metal atoms but rather occupy the gaps between them, which affects the properties of the metal such as hardness and strength.
3. Compare this with substitutional alloys, where atoms of similar size replace metal atoms in the lattice, forming a homogeneous mixture.
4. Recognize that an interstitial alloy is not a compound formed by a chemical reaction, but rather a physical mixture where the smaller atoms are trapped within the metal lattice.
5. Conclude that the best description of an interstitial alloy is: 'A mixture in which small atoms occupy spaces between the larger metal atoms in a crystal lattice.'