1. What is the solid state of matter, and how is it different from other states of matter?

2. Define the terms crystal lattice and unit cell. How are they related in a crystalline solid?

3. Explain the difference between amorphous and crystalline solids, giving examples of each.

4. What are the seven crystal systems, and how do they differ from each other?

5. Discuss the concept of packing efficiency in a crystal lattice.

6. Define the terms 'density' and 'coordination number' in the context of a solid state.

7. How are the types of voids (tetrahedral and octahedral) formed in a crystal lattice?

8. Explain the Bragg's law and its significance in X-ray crystallography.

9. Describe the structure of the following crystal lattice: NaCl (Sodium chloride) and diamond.

10. What are the different types of imperfections that can occur in a crystal lattice?