1. Explain how dipole - dipole interactions hold molecules together in polar solids.

2. Diamond a covalent solid. Explain.

3. Silicon exists in network solids. Explain?

4. How many units cells are shared equally in a face centered cubic cell?

5. Triclinic crystal system is the most unsymmetrical crystal system. Explain.

6. How many unit cells does a corner has in simple cubic cell.

7. What is a lattice point?

8. Explain how metallic crystals conduct heat and electricity.

9. Explain why Quartz is a covalent solid?

10.  What type of crystal is solid carbon dioxide?