Calculate the total number of atoms in a $bcc$ crystal lattice containing $2 \times 10^{23}$ unit cells.

For an ionic crystal with the general formula $AX$,the coordination number is $6$. What is the radius ratio range?

Which statement is correct for $Fe_3O_4$?

The coordination number of a metal crystallizing in a hexagonal close packed structure is

In an $fcc$ crystal lattice,atoms $A$ are present at the corners and atoms $B$ are present at the face centers. If one atom $A$ is missing from a corner,what is the molecular formula of the compound?

The coordination number of cation and anion in fluorite $CaF_2$ and anti-fluorite $Na_2O$ are respectively