In network of silica (SiO2) each silicon atom is surrounded by _____________ atoms of osygen?
Correct answer: A. 4
- A. 4
- B. 2
- C. 1
- D. 6
Explanation
In the silica network, each silicon atom forms four Si-O covalent bonds arranged tetrahedrally, so it is surrounded by 4 oxygen atoms. The likely mistake is choosing 2, by confusing the SiO2 formula ratio with the number of oxygen atoms directly bonded to each silicon.
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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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