Length of a face edge in lithium chloride crystal is `5.11 A^(0) `. What is the radius of anion of the crystal?

Explanation

`LiCl` is assumed to have the structure of `NaCl` face centred cubic lattice, in which face diagonal has anions touching each other.
Face diagonal length `= sqrt2 a= 4 xx` radius of chloride
Face edge length of `Li CI= a = 5.11 A^(0) `
Radius of chloride `= ( sqrt2)/( 4) a = ( 1.414)/( 4) xx 5.11 = 1.81 A^(0)`