Fill in the blanks

1. The packing efficiency of fee unit cell is ………

2. ……… defect arises due to the missing of equal number of cations and anions from the crystal lattice.

3.Presence of large number of schottky defects in a crystal, lowers its …………

4. Vanadium monoxide shows ………defect. 

5. ……… arises due to the dislocation of ions from its crystal lattice. 

6. ……… arises due to the presence of more number of metalions as compared to anions. 

7. ZnO is …… at room temperature but when it is heated it becomes in colour. 

8. …………arises due to the presence of less number of cations than the anions.

9. ……… is the appearance of an electrical potential across the sides of the crystal, when it is subjected to mechanical stress. 

10. Stoichiometric defects in an ionic solid is also called …… or ……… defect.