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

If all ions touching an axis passing through two opposite face-centres of unit cell are removed in $NaCl$ (rock salt) structure in which $Cl^{-}$ ions form $CCP$ and $Na^{+}$ ions occupy all octahedral voids,then the effective number of $Cl^{-}$ ions per unit cell is:

In a body-centered cubic $(BCC)$ unit cell,the atom at the body center is shared by how many unit cells?

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 ............... $pm$.

Determine the number of atoms per unit cell in a body-centered cubic $(BCC)$ unit cell.

For some crystals,the radius ratio for cation and anion is $0.525$,its coordination number will be