Pick the crystalline solid:
Correct answer: D. Copper
- A. Cement
- B. Ceramics
- C. Concrete
- D. Copper
Explanation
Copper is a metal whose atoms sit in a regular repeating lattice, so it is crystalline and melts at one sharp temperature. Cement, ceramics and concrete are amorphous or mixed materials with only short range order, so they soften over a range rather than melting cleanly. A sharp melting point is the practical test for crystallinity.
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About Crystalline Solids
Crystalline solids contain particles arranged in a regular repeating lattice described by a unit cell. Their study includes coordination number, packing efficiency, density, anisotropy, cleavage, polymorphism and common crystal systems, along with ionic, molecular, covalent network and metallic crystals. Crystalline order differs from the random arrangement of amorphous solids.
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