The number of carbon atoms per unit cell of diamond unit cell is

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?

If $AgI$ crystallises in zinc blende structure with $I^{-}$ ions at lattice points,what fraction of tetrahedral voids is occupied by $Ag^{+}$ ions? ............ $\%$

In $NaCl$ lattice,the coordination number of $Cl^{-}$ ion is:

If the edge length of a cubic unit cell in an $fcc$ structure is $620 \ pm$, then the atomic radius of the element will be ............... $pm$.