Draw the points of two dimensional lattice with sequence of unit cells. 

How many types of two-dimensional lattice exist? Why pentagonal latticis not possible?

The number of atoms per unit cell of the two dimensional square unit cell shown below is:

A : A particle at the corner of CCP unit cell has (1)/(8)th of its contribution to the unit cell. R : In any space lattice the corner of the unit cell is always shared by the eight unit cell.

The radius of an atom is 100 pm. If this element crystallizes in FCC lattice, the edge length of unit cell is

The packing efficiency of the two dimensional square unit cell shown below is:

A metal crystallize in a body centered cubic lattice (bcc) with the edge of the unit cell 5.2Å . The distance between the two nearest neighour is

Silicon crystallises in fcc lattice, a single crystal of high purity like diamond. Gram atomic weight of silicon is 28 g mol^(-1) . Edge length of unit cell is 0.543nm. Calculate the number of silicon atoms per unit cell and density of unit cell.

The unit cell of a NaCl lattice :

The packing efficiency of a two-dimensional square unit cell shown below is