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(A) Schottky defect is a type of point defect in ionic crystals where an equal number of cations and anions are missing from their lattice sites.This

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High coordination number and similar sizes

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(A) Schottky defect is a type of point defect in ionic crystals where an equal number of cations and anions are missing from their lattice sites.This defect is typically observed in ionic compounds that have a $High \ coordination \ number$ and where the sizes of the cations and anions are $similar$ (i.e.,the radius ratio is close to $1$).Examples include $NaCl$,$KCl$,and $CsCl$.

Which relationship is correct regarding the coordination number and the size of cations and anions in ionic compounds exhibiting Schottky defect?

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