Question

The coordination number of cation and anion in anti-flourite $N{a}_{2}O$ is:

• A. $4:4$
• B. $4:6$
• C. $8:4$
• D. $4:8$

Answer 1

The correct option is D $4:8$

In case of $N{a}_{2}O$, the $O^{2-}$ ions are present in FCC manner and the $N{a}^{+}$ ions are present at the tetrahedral sites. So, the coordination number of $N{a}^{+}$ is $4$ and that of $O^{2-}$ is $8$.