1. a). Using lithium of atomic number 3 and chlorine of atomic number 17 describe electroovalent bonding. b) Using an orthorhombic lattice structure of a = 3cm, b=4cm and c = 5.5cm draw and show the following lattice point (111) (212) (100) (2 using the phase transformation system distinguish between completely soluble and limited solubility 2. a) using the theory of completely soluble distinguish between substitution and interstitial solid solutions. b) Name the three (3) unit cells commonly found in metal structures and briefly explain the method of their formation find the packing efficiency of a simple cubic lattice. 3. a) Write the electronic configuration of Li and Fe and explain the possible valency they can exhibit. b) Name the three (3) unit cells commonly found in metal structures and briefly explain the method of their formation. Find the packing efficiency of a simple cubic lattice. 4.a) Distinguish between a unit cell and a crystal. b) Prove that for a FCC lattice structure c) Prove that for BCC unit cell, volume (Vecc), d) Hence or otherwise find the APF for BCC 5.a) State Bragg's law. b) Find the index of a plane that intercepts the three axes at a unit cell distance (121) If for a certain BCC crystal, the (110) plane has a separation of 1.181A and wavelength of X-ray is 1.540A. Find the glance angle for the 1" line of reflection. Hence find the atomic radius. INITIALS OF EXAMINER: BP Dw. Se EMO Page 1 Heren Nettetari prd DIRA 1. a). Using lithium of atomic number 3 and chlorine of atomic number 17 describe electroovalent bonding. b) Using an orthorhombic lattice structure of a = 3cm, b=4cm and c = 5.5cm draw and show the following lattice point (111) (212) (100) (2 using the phase transformation system distinguish between completely soluble and limited solubility 2. a) using the theory of completely soluble distinguish between substitution and interstitial solid solutions. b) Name the three (3) unit cells commonly found in metal structures and briefly explain the method of their formation find the packing efficiency of a simple cubic lattice. 3. a) Write the electronic configuration of Li and Fe and explain the possible valency they can exhibit. b) Name the three (3) unit cells commonly found in metal structures and briefly explain the method of their formation. Find the packing efficiency of a simple cubic lattice. 4.a) Distinguish between a unit cell and a crystal. b) Prove that for a FCC lattice structure c) Prove that for BCC unit cell, volume (Vecc), d) Hence or otherwise find the APF for BCC 5.a) State Bragg's law. b) Find the index of a plane that intercepts the three axes at a unit cell distance (121) If for a certain BCC crystal, the (110) plane has a separation of 1.181A and wavelength of X-ray is 1.540A. Find the glance angle for the 1" line of reflection. Hence find the atomic radius. INITIALS OF EXAMINER: BP Dw. Se EMO Page 1 Heren Nettetari prd DIRA
