The crystal system having a = β ≠ c and α = β = γ = 90° is:
Correct answer: B. Tetragonal
- A. Hexagonal
- B. Tetragonal
- C. Monoclinic
- D. Triclinic
Explanation
In the Tetragonal crystal system: The three crystallographic axes are all perpendicular to each other (α = β = γ = 90°). Two of the axes (a and b) have the same length (a = b), and these are perpendicular to each other. The third axis (c) has a different length (c ≠ a or b). So, in the Tetragonal crystal system, the unit cell is a rectangular prism with two edges of equal length (a and b) and one edge of a different length (c), with all right angles between the edges.
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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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