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The number of atoms contained in an fcc unit cell of a monoatomic substance is

1. 1
2. 2
3. 4
4. 6

Correct answer: 4

Solution

In an fcc (face-centered cubic) unit cell, there are 8 corner atoms, each contributing 1/8, and 6 face-centered atoms, each contributing 1/2. This totals to 4 atoms per unit cell.

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