Distinguish between crystal lattice and unit cell.

How will you distinguish between the following pairs of terms? a. Hexagonal close-packing and cubic close-packing b. Crystal lattice and unit cell c. Tetrahedral void octahedral void

How will you distinguish between the following pairs of terms (i) Hexagonal close packing and cubic close packing (ii) Crystal lattice and unit cell (iii) Tetrahedral void and octadedral void.

How will you distinguish between the following pairs of terms: (i) Tetrahedral and octahedral voids (ii) Crystal lattice and unit cell

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

The regular three dimensional arrangement of points in a crystal is known as crystal lattice and the smallest repeating pattern in the lattice is called unit cell. The unit cells are characterised by the edge lengths a, b, c and the angles between them alpha, beta and gamma respectively. Based on this, there are seven crystal systems. In a cubic unit cell: a=b=c and alpha = beta=gamma=90^(@) The number of points in simple, body centred and face centred cubic cells are 1,2 and 4 respectively In both the hcp and ccp of spheres, the number of tetrahedral voids per sphere is two while the octahedral voids is one. In a face centred cubic cell, an atom at the face contributes to the unit cell