Which kind of defect is shown by the given crystal?

In the given figure two K and two Cl are absent. In ionic crystals, the defect forms when oppositely charged ions leave their lattice sites, creating vacancies. These vacancies are formed in stoichiometric units, to maintain an overall neutral charge in the ionic solid. So, the given figure shows Schottky defect. Hence the correct answer is option (a) 127. What type of crystal defect is indicated in the diagram shown below ? (a) Frenkel defect (b) Schottky defect (c) Interstitial defect (d) Frenkel and Schottky defects In the given figure two + - Na and Cl are absent. In ionic crystals, t