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If the close-packed cations in an AB-typ...

If the close-packed cations in an `AB`-type solid gave a radius of `75` pm. What would be the maximum and minimum sizes of the anions filling the voids?

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The correct Answer is:
102.5 pm , 181.2 pm
For close packed AB type solid with NaCl structure , `r_+/r_(-)`=0.414-0.732
`therefore` Minimum value of `r_(-)=r_(+)/0.732=75/0.732` pm =102.5 pm , Maximum value of `r_(-)=r_(+)/0.414=75/0.414` =181.2 pm .
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