The edge length of a face-centered cubic unit cell of an ionic substance is $508 \ pm$. If the radius of the cation is $110 \ pm$, what is the radius of the anion in $pm$?

In a $ccp$ lattice of $X$ and $Y$,$X$ atoms are present at the corners while $Y$ atoms are at face centers. What would be the formula of the compound if one of the $X$ atoms from a corner is replaced by a $Z$ atom?

The number of nearest neighbours in a $BCC$ unit cell is

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

In the fluorite structure,the coordination number of $Ca^{2+}$ ion is

In the fluorite structure,the coordination number of the $Ca^{2+}$ ion is.....