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Na and Mg crystallize in BCC and FCC type crystals respectively, then the number of atoms of Na and Mg present in the unit cell of their respective crystal is

1. 4 and 2
2. 9 and 14
3. 14 and 9
4. 2 and 4

Correct answer: 2 and 4

Solution

Na (BCC) has 2 atoms per unit cell and Mg (FCC) has 4 atoms per unit cell, so the answer is 2 and 4.

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