In the rhombohedral system, all three angles lie between _˚.
Correct answer: B. 90 & 120
- A. 90 & 45
- B. 90 & 120
- C. 45 & 90
- D. 120 & 180
Explanation
In a rhombohedral or trigonal system, all the three axes are of an equal length like a cubic system but the three angles are not equal and lie between 90 and 120˚.
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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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