Alloys exhibit mixed metal atoms in a lattice

Steps:

• Define alloy as a homogeneous mixture of two or more metals forming a solid solution.
• Recall pure metals have identical atoms in a regular lattice.
• Examine diagrams for irregular substitution of atoms in the lattice.
• Select the one showing random mixing without ordered structure.

Why B is correct:

• B depicts a crystal lattice with two different metal atoms randomly substituted, matching the definition of a substitutional alloy solid solution.

Why the others are wrong:

• A shows uniform identical atoms in a lattice, representing a pure metal.
• C illustrates an ordered arrangement of atoms, indicating an intermetallic compound.
• D lacks a defined lattice structure, suggesting a non-crystalline or molecular solid.

Final answer: B