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  4. Body centred cubic and face centred cubic unit cells have n1 and n2 effective number of atoms. Which one the following (.n1,n2.) combination is correct?

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Q. Body centred cubic and face centred cubic unit cells have $n_{1}$ and $n_{2}$ effective number of atoms. Which one the following $\left(\right.n_{1},n_{2}\left.\right)$ combination is correct?

NTA AbhyasNTA Abhyas 2020The Solid State

Solution:

Number of atoms in

BCC unti cell $=1+8\times \frac{1}{8}=1+1=2$

FCC unit cell $=8\times \frac{1}{8}+6\times \frac{1}{2}=1+3=4$