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

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

Text Solution

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For the close-packed `AB`-type solid,
`(r_(o+))/(r_(Θ)) = 0.414 - 0.732`
`:.` Minimum value `r_(Θ) = (r_(o+))/(0.732)`
`= (75)/(0.732) pm = 102.5 "pm"`
Maximum value of `r_(Θ) = (r_(o+))/(0.414) = (75)/(0.414) = 181.2` pm
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