1.

Distinguish between : (i) Hexagonal and monoclinic unit cells. (ii) Face-centred and end-centred unit cells.

Answer» (i) For hexongonal unit cell , ` a = b ne c, alpha = beta = 90^(@) , gamma= 120^(@)`
for monoclinic unit , ` a ne b ne c, alpha = gamma = 90^(@) , beta ne 90^(@)` ,
(ii) A face -centred unit cell has one constituent paticel present at the centre of each face in addition to the particles present at the corners.
An end-face centred has one constituent particle each at the centre of any two opposite faces in addition to the particles present at the corners.


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