Which of the following statements describes a crystalline solid?
Correct answer: B. Particles are arranged in a long-range, repeating 3D pattern.
- A. Particles are randomly arranged with no repeating pattern.
- B. Particles are arranged in a long-range, repeating 3D pattern.
- C. It softens gradually over a range of temperatures.
- D. It has no definite shape or melting point.
Explanation
A crystalline solid has its particles arranged in a regular three dimensional pattern repeated throughout the crystal, which gives it a sharp melting point and definite shape. Random arrangement and gradual softening over a range of temperature describe amorphous solids such as glass.
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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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