Quartz is a/an _ crystal.
Correct answer: B. Covalent
- A. Metallic
- B. Covalent
- C. Molecular
- D. Ionic
Explanation
Quartz or Silica has the molecular formula SiO2. Each Si atom is covalently bonded to 4 O atoms, but every O atom is shared between two Si atoms. Thus, every Si atom is effectively bonded with 4/2 = 2 O atoms. Hence, the formula is SiO2 instead of SiO4. grey atoms: Si red atoms: O
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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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