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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 ?

Text Solution

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ccp is 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.
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