A defect in an ionic lattice that occurs when one of the ions is in the wrong position is called a(n) _____.

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A Frenkel defect occurs when an ion in an ionic lattice is displaced from its normal position and moves to occupy an interstitial site, leaving behind a vacancy at its original site. This type of defect is also known as a dislocation defect or a point defect. Planar and line defects refer to structural defects in crystalline materials, while Schottky defects occur when a pair of oppositely charged ions are missing from the lattice. Edge dislocations are a type of line defect that occur at the boundary between two crystalline grains.

A Defect in an Ionic Lattice That Occurs When One