When the atoms of third layer are arranged in such a way that they directly lie above the atoms of first layer then this arrangement is called_________________?
Correct answer: A. ABAB (hexagonal)
- A. ABAB (hexagonal)
- B. ABCABC (Cubic)
- C. Orthor hombic
- D. Rhombohedral
Explanation
If the third layer lies directly above the first, the stacking sequence repeats as A-B-A-B, which is the hexagonal close-packed arrangement. Students may choose A-B-C-A-B-C because both are close-packed arrangements, but that sequence places the third layer in a new position rather than directly above the first.
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A crystal lattice is the regular three-dimensional arrangement of particles in a crystalline solid. The content includes lattice points, unit cells, coordination number, packing patterns, and the differences among ionic, metallic, molecular and covalent network crystals, which should not be confused with amorphous solids.
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