Distinguish between
(a). Hexagonal and monoclinic unit cells
(b) Face-centred and end-centred unit cells

Explanation

`{:("Hexagonal unit cell","Monoclinic unit cell"),(a=bcancel=c,acancel=bcancel=c),(alpha=beta=90^(@),alpha=y=90^(@)),(y=120^(@),betacancel=90^(@)):}`
(ii) Face-centred unit cell Endcentred unit cell
A Face-centred unit cell the constituent particles And End-centred unit cell contains particles at the
are present at the corners and one at the centre of each face. corners and one at the centre of any two opposite faces.
Total no of particles in a face centred unit cell=4 Total no. of partilces in an end centered unit cell=2