Question

Coordination number of $Cs^{+}$and $Cl^{-}$in $CsCl$Crystal

are

• A. 8,8
• B. 4,4
• C. 6,6
• D. 8,4

Answer 1

Answer: (A)

8,8

Answer 2

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