Question

The coordination number of $C{s}^{+}$ and $C{l}^{-}$ ions in $CsCl$ structure is_________.

• A. $4:4$
• B. $6:6$
• C. $8:8$
• D. $4:8$

Answer 1

The correct option is C $8:8$

$CsCl$ has body-centred cubic (bcc) arrangement. Each $C{s}^{+}$ ion is surrounded by $8$ $C{l}^{-}$ ion and each $C{l}^{-}$ is surrounded by $8$ $C{s}^{+}$ ions. Therefore, the structure has $8:8$ co-ordination.