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The arrangement ofCI^(-) ions in CsCI st...

The arrangement of`CI^(-)` ions in `CsCI` structure is

A

hcp

B

fcc

C

bcc

D

Simple cubic

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The correct Answer is:
D
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The tetrahedral voids formed by cup arrangement of CI^(-) ions in rock salt structure are

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In a close packed structure, the atoms stack together occupying maximum space and leaving minimum vacant space. The close packing arrangment may be hcp (ABABA….) or ccp (ABCABCA….). In these arrangments, there is one octahedral void and two tetrahedral voids. Depending upon the ratio of size of cation and anion, the ions of one type occupy the voids of other ions. This results in different types of crystalline structures. Predict the coordination number of Cs^(+) ion and structure of CsCl , if radii of Cs^(+) and Cl^(-) ions are 1.69 Å and 1.81 Å respectively.