Chemistry - Solid State Question with Solution | TestHub

Frenkel defect is a type of point defect in crystalline solids where an ion (usually a cation, due to its smaller size) is displaced from its regular lattice site and occupies an interstitial site.

Since no ions are lost from the crystal as a whole, the density of the solid remains unchanged.

Electrical neutrality is maintained because the total number of cations and anions remains the same.

The statement describing an equal number of cations and anions missing from their regular sites refers to a Schottky defect, which causes a decrease in density.

Answer: It arises when an ion of an ionic compound is missing from its regular site and occupies an interstitial position.