All of the following share the same crystal structure except:

What is the coordination number of sodium in $Na_2O$?

In a mixed oxide of two metals $X$ and $Y$,divalent $X^{2+}$ ions occupy $50\%$ of the tetrahedral voids,while trivalent $Y^{3+}$ ions occupy $50\%$ of the octahedral voids. The formula of the oxide is:

Which statement is correct for $Fe_3O_4$?

$A$ crystal is formed by two elements $X$ and $Y$ in a cubic structure. $X$ atoms are at the corners of a cube,while $Y$ atoms are at the face centers. The formula of the compound will be:

The number of octahedral voids in a unit cell of a cubical closest packed structure is