First slide

Crystal lattices and unit cells

Question

The radius of Ag⁺ ion is 126 pm while that of I^- ion is 216 pm. The co-ordination number of Ag⁺ in Agl is:

Moderate

Solution

$\frac{r_{c a t i o n}}{r_{a n i o n}} = \frac{126}{216} = 0.5834 0.414 - 0.732 r a n g e o f l i m i t i n g r a d i u s w i l l h a v e c o - o r d i n a t i o n n u m b e r 6$

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