The sum of the number of first and second nearest neighbors in an $FCC$ closed packing is:

The structure of $MgO$ is similar to $NaCl$. What would be the coordination number of magnesium?

If the length of the body diagonal of a $FCC$ unit cell is $x \ \mathring{A}$, the distance between two nearest octahedral voids in the cell in $\mathring{A}$ is

Gold has a face-centred cubic $(fcc)$ lattice with an edge length of the unit cube of $407 \ pm$. Assuming the closest packing, the diameter of the gold atom is .............. $pm$.

$A$ solid $A^{+}B^{-}$ has a $NaCl$ type close-packed structure. If the radius of the anion is $250 \ pm$, what should be the ideal radius of the cation in $pm$?

If a metal has a $fcc$ crystal structure,the coordination number is $12$ because