Which term defines solid matter with atoms arranged in a regular, repeating pattern?

Which term defines solid matter with atoms arranged in a regular, repeating pattern?

• A. Crust
• B. Crystal
• C. Crystal planes
• D. Crystalline

Answer: (B)

A crystal is a solid whose atoms are arranged in a highly ordered, repeating pattern that extends in all directions. That precise, long-range order is what defines the material as a crystal, making the noun form the best fit for the term described in the question. The word “crystalline” describes the property of having such order (it's an adjective), not the substance itself. “Crystal planes” refer to specific geometric planes within the lattice, not the overall material. “Crust” is unrelated to atomic arrangement in solids.

A crystal is a solid whose atoms are arranged in a highly ordered, repeating pattern that extends in all directions. That precise, long-range order is what defines the material as a crystal, making the noun form the best fit for the term described in the question. The word “crystalline” describes the property of having such order (it's an adjective), not the substance itself. “Crystal planes” refer to specific geometric planes within the lattice, not the overall material. “Crust” is unrelated to atomic arrangement in solids.