Which of the following is NOT a type of crystalline solid? (2021)

Which of the following is NOT a type of crystalline solid? (2021)

Step 1: Understand what a crystalline solid is. Crystalline solids have a regular, repeating arrangement of atoms or molecules.
Step 2: Identify the types of crystalline solids. Common types include ionic, covalent, metallic, and molecular solids.
Step 3: Learn about amorphous solids. Amorphous solids do not have a regular structure and lack long-range order.
Step 4: Compare crystalline solids with amorphous solids. Since amorphous solids do not have a repeating structure, they are NOT classified as crystalline solids.
Step 5: Conclude that the answer to the question is amorphous solids, as they are the type that is NOT a crystalline solid.

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