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Coordination Number

The radius of...

Question

The radius of $A g^{+}$ is $126 p m$ while that of $C l^{-}$ ion is $216 p m$ . The co-ordination number of $A g$ in $A g C l$ is

2

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8

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6

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4

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Solution

The correct option is C $6$
$\frac{r^{+}}{r^{-}} = \frac{r_{A g^{+}}^{+}}{r_{I^{-}}} = \frac{126}{216} = 0.5834$
If $\frac{r^{+}}{r^{-}} ϵ [0.414, 0.732)$
Coordination number is 6. Compound crystal structure must be similar to rock salt structure.

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