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Standard XII

Chemistry

Introduction to d and f Block Elements

Ionic radii o...

Question

Ionic radii of $M g^{2 +}$ and $O^{2 -}$ ions are $66$ pm and $140$ pm respectively. The type of interstitial void and coordination number of $M g^{2 +}$ ion are :

tetrahedral,

12

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octahedral,

6

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tetrahedral,

6

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octahedral,

8

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Solution

The correct option is B octahedral, $6$
According to radius ratio rule,

$\frac{r_{+}}{r_{-}} = \frac{66}{140} = 0.47$
Since $0.414 <$ $\frac{r_{+}}{r_{-}}$ $< 0.732$ , the type of interstitial void is octahedral and coordination number of $M g^{2 +}$ ion is $6$ .

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Ionic radii of $M g^{2 +}$ and $O^{2 -}$ ions are 66 pm and 140 pm respectively. The type of interstitial void and coordination number of $M g^{2 +}$ ion respectively are

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Ionic radii of Mg2+ and O2− ions are 66 pm and 140 pm respectively. The type of interstitial void and coordination number of Mg2+ ion are :

The correct option is B octahedral, 6According to radius ratio rule,r+r−=66140=0.47Since 0.414< r+r− <0.732, the type of interstitial void is octahedral and coordination number of Mg2+ ion is 6.

Ionic radii of $M g^{2 +}$ and $O^{2 -}$ ions are $66$ pm and $140$ pm respectively. The type of interstitial void and coordination number of $M g^{2 +}$ ion are :

The correct option is B octahedral, $6$
According to radius ratio rule,

$\frac{r_{+}}{r_{-}} = \frac{66}{140} = 0.47$
Since $0.414 <$ $\frac{r_{+}}{r_{-}}$ $< 0.732$ , the type of interstitial void is octahedral and coordination number of $M g^{2 +}$ ion is $6$ .