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Question 12

Distinguish between

(i)Hexagonal and monoclinic unit cells

(ii) Face-centred and end-centred unit cells.

Answer

(i) Hexagonal unit cell

For a hexagonal unit cell,

 

Monoclinic unit cell

For a monoclinic cell,

 

(ii) Face-centred unit cell

In a face-centred unit cell, the constituent particles are present at the corners and one at the centre of each face.

End-centred unit cell

Anend-centred unit cell contains particles at the corners and one at the centre of any two opposite faces.

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