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KF has ccp structure. Calculate the radi...

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 ?

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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.
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