Ammonium chloride crystallises in a body-centred cubic lattice with a unit distance of 387 pm. Calculate (a) the distance between oppositely charged ions in the lattice and (b) the radius of the NH+4 ion if the radius of Cl− ions is 181 pm.
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Solution
(a) In a body-centred cubic lattice, oppositely charged ions touch each other along the cross-diagonal of the cube.