(B) Most ionic crystals,especially those with high coordination numbers and similar sized cations and anions (like $NaCl$),exhibit $Schottky$ defects.

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(B) Most ionic crystals,especially those with high coordination numbers and similar sized cations and anions (like $NaCl$),exhibit $Schottky$ defects. In this defect,an equal number of cations and anions are missing from their lattice sites,maintaining electrical neutrality.