Define unit cell.

Give any three characteristics of ionic crystals.

Differentiate crystalline solids and amorphous solids.

Classify the following solids
a. P₄
b. Brass
c. diamond
d. NaCl
e. Iodine

Explain briefly seven types of unit cell.

Distinguish between hexagonal close packing and cubic close packing.

Distinguish tetrahedral and octahedral voids.

What are point defects?

What type of stoichiometric defect is shown by ZnS.

Which point effect in crystal doesn't alter the density of the relevant solid?

What are primitive unit cells?

Name the seven primitive crystal systems.

Distinguish between cubic and hexagonal unit cells.

Frenkel defect is not show by alkali metal halides but silver halides do. Give reason.

The energy required to vapourise one mole of copper is smaller than that of energy required to vapourise 1 mole of diamond why?