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# If the radius of $Cs^+$ is 169pm and that of $Cl^-$ is 181pm then find the co-ordination number of $Cs^+$

$(a)\;7\qquad(b)\;8\qquad(c)\;9\qquad(d)\;10$

$\large\frac{r^+}{r^-} = \large\frac{169}{181}$
$\;\;\;\;\;\;\;=0.94$
$\therefore$ CsCl crystallizes in b.c.c lattice with co-ordination number of $Cs^+$ = 8