KF has ccp structure. Calculate the radius of the unit cell if the edge length of the unit cell is 400 pm. How many `F^(-)` ions and octahedral voids are there in the unit cell ?

Explanation

For ccp unit cell, radius (r) `=(sqrt2a)/(4)`
`=(sqrt2xx(400"pm"))/(4)=(1.414xx(400"pm"))/(4)`
There are four `F^(-)` ions and four octahedral voids per unit cell.