Question

The radius of $A{g}^{+}$ ion is $126$ pm and of $I^{-}$ ion is $216$ pm. The coordination number of $A{g}^{+}$ in $AgI$ is:

• A. $2$
• B. $4$
• C. $6$
• D. $8$

Answer 1

The correct option is C $6$

$\frac{r_{A{g}^{+}}}{r_{I^{-}}}=\frac{126}{216}=0.583$

$\Rightarrow$Octahedral void $(0.414-0.732)$
$\therefore$ C. N. $A{g}^{+}$ ion is $6$