In an ab type solid the cation has a radius 75pm. what should be the maximum and minimum size of the anion filling the voids? 4
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The minimum and the maximum sizes can be calculated with the help of radius ratio. For a tetrahedral void, the radius ratio (= r+/r-) has the limiting values of 0.225-0.414. For octahedral voids, the radius ratio has the limiting values of 0.414-0.732.Therefore the maximum size of the anions is r- = r+/0.225 = 75/0.225 = 333.33 pm and minimum = 75/0.732 = 102.459 pm.
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