Question:

CsCl crystallises in body centred cubic lattice. If a is its edge length, then which of the following expressions is correct?

rCs++rCl−=3a2

rCs++rCl−=3a

rCs++rCl−=√32a

rCs++rCl−=√3a

In CsCl structure, Cs+ ion is in contact with Cl− ion at the nearest distance which is equal to √3a/2.