Cl (-) ion form fcc lattice and Na+ ions occupy all octahedral voids of the unit cell.

Ca2+ ions form fcc lattice and F? ions occupy all the eight tetrahedral

O2- ions form fcc lattice and Na+ ions occupy all the eight tetrahedral voids of the unit cell.

S2- ions form fcc lattice and Zn2+ ions go into alternate tetrahedral voids of the unit cell.

2

3

4

6

Dislocation defect

Schottky defect

Frenkel defects

Electronic defects

p-type semiconductor

n-type semiconductor

intrinsic semiconductor

insulator

Paramagnetic substances are weakly attracted by magnetic field.

Ferromagnetic substances cannot be magnetised permanently.

The domains in anti-ferromagnetic substances are oppositely oriented with respect to each other.

Pairing of electrons cancels their magnetic moment in the diamagnetic substances.