The spinel structure consists of ............

Write a note on interstitial sites or voids.

In a compound,atoms of element $Y$ form $ccp$ lattice and those of element $X$ occupy $2/3$ of tetrahedral voids. The formula of the compound will be

The number of octahedral void$(s)$ per atom present in a cubic close-packed structure is

In an $FCC$ unit cell,what fraction of the edge length is not covered by atoms?

In an ionic solid,anions $(B)$ are arranged in a $ccp$ array and cations $(A)$ occupy $1/3$ of the tetrahedral voids. What is the formula of the ionic compound?