What are the number of atoms per unit cell in $BCC$ and $FCC$ respectively?

The radius of a calcium ion is $94 \text{ pm}$ and of the oxide ion is $146 \text{ pm}$. The possible crystal structure of calcium oxide will be

For an ionic crystal of the general formula $AX$ and coordination number $6$,the value of radius ratio will be

Which of the following characteristics is true for $ZnS$ solid?

The ratio of anion radius to cation radius of a crystal is $10 : 9.3$. Then, the coordination number of the cation in the crystal is

In a cubic structure,$W$ atoms are present at the corners of the unit cell,$O$ atoms are at the edge centers,and $Na$ atoms are at the center of the cube. What is the formula of the compound?