Structure of Ionic Compounds

Question

In case of ionic solids maximum possible coordination number is _________?

Answer 1

In case of ionic solids maximum possible coordination number is the maximum number of neighboring atoms of the central atom.  If you are looking for an actual number as the answer, then it would be 12, and this occurs if all atoms of the crystal are of the same size.  Otherwise, the number depends on the relative size of the atoms that make up the lattice.