All of the following crystal systems have α=β=γ=90° except:
Correct answer: D. Rhombohedral
- A. Cubic
- B. Orthrombic
- C. Tetragonal
- D. Rhombohedral
Explanation
Option D is correct.The crystal system that does not have β=γ=90° is rhombohedral. The other three crystal systems, cubic, orthorhombic, and tetragonal, all have the following properties: Cubic: a=b=c, α=β=γ=90° Orthorhombic: a≠b≠c, α=β=γ=90° Tetragonal: a=b≠c, α=β=γ=90° The rhombohedral crystal system, on the other hand, has the following properties: a=b=c, α=β=γ≠90° The angle α=β=γ in the rhombohedral crystal system is typically between 60° and 120°, but it can be outside of this range.
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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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