Question

The unit cell cube length of LiF having rocksalt structure is 4.02 A0. Assuming anion-anion contact the ionic radius of fluoride ion is?
no spamming. please help

Answer 1

Answer:

In LiCl structure, anions have face centered cubic arrangements. In such a unit cell face diagonal is four times the radius of anions.

Face diagonal =

2

.a=

2

×5.14A

0

Face diagonal =4r

∴ 4r=

2

×5.14A

0

⇒r=1.82A

0