Schottky defect in a crystal is observed when

Options

A. an ion leaves its normal site and occupies an interstitial site
B. unequal number of cations and anions are missing form the lattices
C. density of the crystal is increased
D. equal number of cations and anions are missing from the lattice

Answer

4

Explanation

If in an ionic crystal of the type `A^(+)B^(-)` equal number of cations and anions are missing from their lattice sites so that the electrical neutrality is maintained.it is called Schoottky defect.