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  4. Coordination numbers of Cs+ and Cl- in CsCl crystal are

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Q. Coordination numbers of $Cs^+$ and $Cl^-$ in $CsCl$ crystal are

The Solid State

Solution:

$CsCl$ has a $bcc$ structure. Each $Cs^+$ ion is surrounded by $8$ $Cl^-$ ions and each $Cl^-$ ion is surrounded by $8$ $Cs^+$ ions. Thus, the structure has $8 : 8$ coordination number.