1.

What ist the coordination number of each ion present in the closed packed sturctures of (a) `Na_(2) O` (b) `CaF_(2)` at ordinary temperature and pressure?

Answer» a. `Na^(o+) = 4, O^(2) = 8`.
b. `Ca^(2+) = 8, F^(ɵ) = 4`


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