CHEM 123 SAMPLE EXAM QUESTIONS 21. How many spheres lie within one unit cell of a body-centred cubic lattice of identical, hard spheres? 2. Aluminum (Al) crystallizes in a face-centred cubic structure. If the radius of the aluminum atom is 140 pm, then what is edge length of the unit cell? A. 200 pm B. 280 pm C. 320 pm D. 400 pm E. 560 pm
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