Question

How many atoms can be assigned to its unit cell if an element forms (i) body centred cubic cell, and (ii) a face centred cubic cell?

Answer 1

if an element forms (i) body centred cubic cell, and (ii) a face centred cubic cell.

Answer 2

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■■Here,So, total no. of atoms/unit cell=1+1=2. In a face centred cubic, there are 6 atoms in the faces, each at one of the 6 faces of the cube.

●● the face centred atoms are shared between two unit cells.

□□So, the contribution of face centred atoms is 6X1/2=3. Besides, it also contains 8 corner atoms shared by 8 other unit cells.