Question

In which of the following structures coordination number for cations and anions in the packed structure will be same ?
A. `Cl^(-)` ion from fcc lattice and `Na^(+)` ions occupy all octahedral voids of the unit cell.
B. `Ca^(2+)` ions from fcc lattic and ` F^(-)` ions occupy all the eight tetrahedral voids of the unit cell.
C. `O^(2-)` ions from fcc lattice and ` Na^(+)` ions occupy all the eight tetrahdral voids of the unit cell.
D. `S^(2-)` ions from fcc lattice and ` Zn^(2+)` ions go into alternate tetrahedral voids of the unit cell.

Answer 1

Correct Answer - C
In ` Na^(+)Cl^(-)` , all cations and anions have a coordination number of 6.