The Solid State — Chemistry STD 12 Science — Question

(i)

Primitive cubic unit cell

(a)

Each of the three perpendicular edges compulsorily have the different edge length i.e; a ≠ b ≠ c.

(ii)

Body centred cubic unit cell

(b)

Number of atoms per unit cell is one.

(iii)

Face centred cubic unit cell

(c)

Each of the three perpendicular edges compulsorily have the same edge length i.e.; a = b = c

(iv)

End centred orthorhombic unit cell

(d)

In addition to the contribution from the corner atoms the number of atoms present in a unit cell is one.

 

 

(e)

In addition to the contribution from the corner atoms the number of atoms present in a unit cell is three.