Consider the following solid having imperfections.⊕⊝○⊝⊕⊝⊝⊕⊝⊕⊝⊕⊕○⊕⊝⊕⊝⊝⊕⊝⊕⊝○⊕⊝⊕○⊕⊝the defect present in the solid is

Ionic solids in which equal number of cations and anions will be missing from their sites is called Schottky defect. It is a vacancy defect.