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  4. Number of atoms in the unit cell of Na ( BCC type crystal) and Mg (FCC type crystal) are respectively :

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Q. Number of atoms in the unit cell of $Na ( BCC$ type crystal) and Mg (FCC type crystal) are respectively :

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Solution:

Na unit cell (body centred cubic)

8 corner atoms $\times \frac{1}{8}=1$

1 atom placed inside the unit cell $=1$

Total atoms $=2$

Mg unit cell (Face centred cubic)

8 corner atoms $\times \frac{1}{8}=1$

6 face atoms $\times \frac{1}{2}=3$

Total atoms $=4$