Question

Schottky defect in crystals is observed when
(a) an ion leaves its normal site and occupies an interstitial site
(b) unequal number of cations and anions are missing from the lattice
(c) density of the crystal increases
(d) equal number of cations and anions are missing from the lattice

Answer 1

dear friend

d).

is the answer

Answer 2

Equal number of cations and anions are missing from the lattice