Equal number of cations and anions are missing

Density of the substance decreases

Electrical neutrality is maintained

Typically observed in compounds with large size difference between cations and anions

Metal excess defect due to interstitial cations and trapped electrons

Metal deficiency defect due to missing anions

Metal deficiency defect due to missing cations

Frenkel defect

${\rm{NaCl}}$

${\rm{AgBr}}$

Graphite

Diamond

Metal deficiency defect

Stoichiometric defect

Frenkel defect

Metal excess defect

Schottky defects decrease the density of the crystal.

F-centers impart color to the crystal.

Frenkel defect is a point defect, while dislocation is a line defect.

A metal deficiency defect is a type of non-stoichiometric defect.

Schottky defect in crystals is observed when equal numbers of cations and anions are missing from the lattice.

F-centers are created when an electron is occupied in the anionic site.

Frenkel defect is a dislocation defect.

Trapping of an electron in the lattice leads to the formation of a hole.

$1{\rm{ }}:{\rm{ }}1$

$1{\rm{ }}:{\rm{ }}2$

$1{\rm{ }}:{\rm{ }}3$

$2{\rm{ }}:{\rm{ }}1$

Positive ions and negative ions are of different size

Positive ions and negative ions are of same size

Positive ions are small and negative ions are big

Positive ions are big and negative ions are small

NaCl

HCl

NaOH

SO2

${\rm{AgBr}}$

${\rm{ZnS}}$

${\rm{Agl}}$

All of these

a bi-triangular void surrounded by six spheres

a bi-triangular void surrounded by four spheres

a bi-triangular void surrounded by eight spheres

a simple triangular void surrounded by four spheres