First slide

Crystal lattices and unit cells

Question

$The ionic radii of A^{+} and B^{-} are 1 .7 Å and 1 .8 Å respectively. Find the co-ordination number of$ A⁺

Moderate

Solution

$\frac{r_{A^{+}}}{r_{B}} = \frac{1 .7}{1 .8} = 0 .944$
$B^{-} are at corner of cube A^{+} at body centre$
$C.No. of A^{+} = 8$

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