Calculate the number of unit cells in $1 \mathrm{~cm}^3$ of an element if unit cell edge length is $2.0 \times 10^{-8} \mathrm{~cm}$.

Calculate the radius of an atom of an element in pm if it forms bcc unit cell structure having edge length $4.3 \times 10^{-8} \mathrm{~cm}$.

The attractive interactions between cations and mobile electrons in metallic solid is called

What is the coordination number of a particle in simple cubic close packed structure?