KF has ccp structure. Calculate the radius of unit cell if the side of the cube or edge length is 400 pm. How many F^- ions and octahedral voids are there in this unitcell ?

KF has ccp structure. Calculate the radius of unit cell if the side of

1.	KF has ccp structure. Calculate the radius of unit cell if the side of the cube or edge length is 400 pm. How many F^- ions and octahedral voids are there in this unitcell ?
Answer» Solution :ccp is same as fcc, Hence, `r=a/(2sqrt2)`=0.3535 a=0.3535 X 400 nm=141.4 PM In fcc structure , there are `4F^-` ions in the packing and hence 4 OCTAHEDRAL voids.