KFhas ccp structure. Calculate the radius of unit cell if the side of the cube or edge length is 400 pm.How manyFe^(-)ions and octahedral voids are there in the unitcell ?

KFhas ccp structure. Calculate the radius of unit cell if the side of

1.	KFhas ccp structure. Calculate the radius of unit cell if the side of the cube or edge length is 400 pm.How manyFe^(-)ions and octahedral voids are there in the unitcell ?
Answer» Solution :ccpis same as fcc, hence,`r= a/ (2sqrt2) = 0.3535 a = 0.3535 xx 400 "pm" = 141.4 ` pm. In fcc, struture, THER are ` 4 F^(-)`ions in the PACKING and hence 4 octahedral VOIDS.