How does the arrangement of atoms in a crystalline substance differ from the arrangement in a noncrystalline (amorphous) substance?
1. Atoms in amorphous materials are in an ordered array. In crystals, they are randomly distributed.
2. Atoms in crystals are located in a cubic array. In amorphous materials, they are hexagonal.
3. Atoms in crystals are closer together than atoms in amorphous materials.
4. Atoms in crystals are in an ordered array. In amorphous materials, they are randomly distributed.
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