In which of the following structures coordination number for cations and anions in the packed structure will be same ?

In which of the following structures coordination number for cations a

1.	In which of the following structures coordination number for cations and anions in the packed structure will be same ?
Answer» `Cl^(-)` ion from fcc LATTICE and `Na^(+)` ions occupy all octahedral voids of the unit CELL. `CA^(2+)` ions from fcc lattic and ` F^(-)`ions occupy all the eight tetrahedral voidsof the unit cell. `O^(2-)` ions from fcc lattice and ` Na^(+)` ions occupy all the eight tetrahdral voids of the unit cell. `S^(2-)` ions from fcc lattice and ` Zn^(2+)` ions go into ALTERNATE tetrahedral voids of the unit cell. Solution :In ` Na^(+)Cl^(-)` , all cations and anions have a coordination NUMBER of 6.