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Ionic Compounds and Radius Ratios

If the radius...

Question

If the radius ratio is between 0.225 - 0.414, what will be the type of void present. What will be the coordination number?

linear

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tetrahedral - 4

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tetrahedral - 2

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octahedral

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Solution

The correct option is B
tetrahedral - 4

If the radius ratio is between 0.225 and 0.414, it will have a tetrahedral void. The derivation of this actually takes place in reverse where we assume a tetrahedral void and arrive at the value, but the converse also holds true. A tetrahedral void naturally means there are 4 surrounding atoms. So, coordination number will be 4.

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Similar questions

If the radius ratio is between 0.414 - 0.732, what will be the type of void present? What will be the coordination number?

0.414 - 0.732

r_{+} / r_{-}

0.225 - 0.414

(\frac{r^{+}}{r^{-}})

0.732

0.414

6

0.732

1.00

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0.155

3

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8

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