The number of atoms contained in one face-centred cubic $(FCC)$ unit cell of a monoatomic substance is:

If an atom is present in the centre of the cube,the participation of that atom per unit cell is

What is the percentage of void space in $bcc$ type of unit cell (in $\%$)?

The number of atoms/molecules contained in one body-centered cubic unit cell is

$A$ binary compound $(A^{+} B^{-})$ has a zinc blende structure where $B^{-}$ ions form the lattice and $A^{+}$ ions occupy $25\%$ of the tetrahedral voids. What is the formula of the compound?

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