In a crystalline solid, atoms or molecules are arranged in orderly, patterned rows. They have uniform melting points. Salt and graphite are good examples of crystalline solids. In an amorphous solid, atoms or molecules are not arranged in any specific order. Unlike crystalline solids, they do not have crisp melting points. Good examples include wood, plastics, and butter.
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Solids are classified by the arrangement of their atoms.