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Which of the following ionic solids has the highest packing efficiency?


Option: 1


Option: 2


Option: 3


Option: 4


Answers (1)


 The correct answer is option (c)ZnS. ZnS,also known as zinc sulfide, has a highest packing efficiency among the given options. ZnS.has a zincblende structure, which has a cubic close-packed (CCP) arrangement of both cations (Zn^{2+}) and anions(S^{2-})in which they occupy alternate positions. This arrangement results in the highest packing efficiency of approximately 74%, which is the maximum possible packing efficiency for ionic solids. NaCl(sodium chloride), CsCl (cesium chloride), andCaF_2(calcium fluoride) have different crystal structures with lower packing efficiencies compared to ZnS. Hence, the correct answer is option (c)ZnS.


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