Question

ii. Calculate the number of atoms in foc
unit cell​

Answer 1

Answer:

Explanation:

In a FCC lattice there rer 8 atoms at eight corners and 6 at face centers,

Now each corner contributes to eight cells so per unit cell contribution is  

8

1

​  

×8=1 atom.

Now similarly each face center contributes to two unit cells so contribution per unit cell by six face centers is equal to  

2

1

​  

×6=3 atoms. Hence total no. of atoms per unit cell of FCC lattice is (1+3)=4 atoms.

Answer 2

Answer:

Total number of atoms in one fcc unit cell =1+3=4. The number of atoms contained in one body-centred cubic unit cell of monoatomic substance is 2. Total number of atoms in one fcc unit cell =1+1=2

Explanation:

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