Ncert Exercises & Solutions

Same coordination number for cations and anions is present in:

1.	Cl^- ions form Fcc lattice and Na⁺ ions occupy all octahedral voids of the unit cell.
2.	Ca²⁺ ions form Fcc lattice and F^- ions occupy all the eight tetrahedral voids of the unit cell.
3.	O^2- ions form Fcc lattice and Na⁺ ions occupy all the eight tetrahedral voids of the unit cell.
4.	S^2- ions form Fcc lattice and K⁺ ions go into alternate tetrahedral voids of the unit cell.