Find the radius of an atom in fcc unit cell having edge length $$405 \mathrm{pm}$$.

Which formula is used to calculate edge length in bcc structure?

What is atomic mass of an element with $$\mathrm{BCC}$$ structure and density $$10 \mathrm{~g} \mathrm{~cm}^{-3}$$ having edge length $$300 \mathrm{~pm}$$ ?

What is the number of unit cells present in a cubic pack crystal lattice having 4 atoms per unit cell and weighing $$0.60 \mathrm{~g}$$ (molar mass $$\left.60 \mathrm{~g} \mathrm{~mol}^{-1}\right)$$ ?