What is the total number of particles present in bcc unit cell?

Calculate the volume of unit cell of an element having molar mass $27 \mathrm{~g} \mathrm{~mol}^{-1}$ that forms fcc unit cell. $\left[\rho . \mathrm{N}_{\mathrm{A}}=16.0 \times 10^{23} \mathrm{~g} \mathrm{~cm}^{-3} \mathrm{~mol}^{-1}\right]$

Calculate the edge length of fcc unit cell if radius of metal atom is 139 pm .

Calculate the edge length of bcc unit cell if radius of metal atom is $$227 \mathrm{~pm}$$.