1.

In an ionic compound the anion (N^(-)) form cubic close type of packing, while the cation (M^(+)) ions occupy one third of the tetrahedral voids. Deduce the empirical formula of the compound and the coordination number of (M^(+)) ions.

Answer»

SOLUTION :Number of `N^(-)` ions `=8XX(1)/(8)=1`
Number of `M^(+)` ions `=(1)/(3)xx2=(2)/(3)`
EMPIRICAL formula `=M_(2//3)N_(1) or M_(2)N_(3)`
Coordination number of `M^(+)` is 4.


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