Final answer:The crystalstructureof an ionic compound is primarily determined by the relative sizes of the cations and anions and the stoichiometry, that is, the ratio of the numbers of positive to negative ions in the compound. This leads to a formation of a crystalline structure. Similar ionic compounds often crystallize in the same structure.Explanation:The crystal structure of an ioniccompoundmainly depends on the sizes of the cations and anions as well as their stoichiometries. Ionic compounds or salts are composed of ions held together by ionic bonds: electrostatic forces between oppositely charged cations and anions.Positive and negative ions are usually arranged in a structure that maximizes the number of opposite charges they are in contact with. This makes the ionic compounds form a crystalline structure that tends to be rigid and brittle.Different types of ionic compounds often crystallize in the same structure when therelativesizes of their ions and their stoichiometries (the ratio of the numbers of positive and negative ions in the compound) are similar. For instance, ionic compounds with similar-sized cations and anions, such as CsCl, usually form a simple cubic structure, which can be described by unit cells with either cations or anions at the corners.Learn more about Crystal Structure of Ionic Compounds here:brainly.com/question/13959473#SPJ11...

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