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CBSE Class 12-science Answered

Hello sir, why calculation of radius ratio is required.how to calculate.Sir,please explain it.
Asked by kanak pandey | 14 May, 2011, 12:00: AM
answered-by-expert Expert Answer
radius ratio plays an important role in determining the structures of ionic solids and coordination number of ions. For eg.
 For cations trp occupy tetrahedral voids radius ratio has range = 0.225 - 0.414, coordination no. = 4.
For cations to occupy octahedral voids radius ratio has range = 0.414 - 0.732, coordination no. = 6.
 If  radius ratio is more then 0.225 cation will occupy trigonal void, coordinatiion no. = 3
If radius ratio is mora than 0.732 catioj will occupy cubic vopid, coordinatiion no. = 8.
 Radius ratio = Radius of cation/Radius of anion.
                   = r+/r-
Answered by | 16 May, 2011, 10:21: AM

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