How many molecules per unit cell are there in a face centred cubic lattice ?
Correct answer: B. 4
- A. 2
- B. 4
- C. 6
- D. 8
Explanation
In a face-centred cubic unit cell, eight corner atoms contribute 1 atom in total and six face-centred atoms contribute 3 atoms, giving 4 molecules or atoms per unit cell. The usual wording is four atoms per unit cell, depending on the substance.
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