Define the following terms: (i) Single Crystalline, Polycrystalline and Amorphous materials, (ii) Lattice, basis and crystal structure,(ii) Bravais lattice. Distinguish between the coordination number and the number of atoms per unit cell. Find both these numbers for a simple cubic lattice, a body centered cubic lattice and a face centered cubic lattice.

Which of the following statement(s) correctly define a Bravais lattice? Choose all that apply. An infinite set of discrete points with an arrangement and orientation that appears exactly the same, from whichever of the points the array is viewed Infinite set of discrete points that periodically occur to meet requirement of translational symmetry O Infinite set of discrete points that periodically occur and are arranged such that the surrounding of every lattice point is identical All lattices are Bravais lattice