The coordination number of an atom in a body-centered cubic $(BCC)$ structure is:
[Assume that the lattice is made up of atoms.]

The mineral $ZnAl_2O_4$ has a spinel structure. The percentage of occupied octahedral voids is ........... $\%$.

The crystal $AB$ has a structure similar to $NaCl$. Atoms of $A$ are present at each corner of the cubic unit cell. If all atoms along one of the axes passing through the face centers are removed,what will be the resulting stoichiometry?

An element has a body-centered cubic $(BCC)$ structure with an edge length of $288 \ pm$. The density of the element is $7.2 \ g/cm^3$. How many atoms are present in $208 \ g$ of the element?

The coordination number of a metal crystallizing in a hexagonal close-packed $(hcp)$ structure is:

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