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 $$227 \mathrm{~pm}$$.

Which from following combinations is an example for construction of n-type semiconductor?

Calculate the density of metal having molar mass $$210 \mathrm{~g} \mathrm{~mol}^{-1}$$ that forms simple cubic unit cell. $$\left(\mathrm{a}^3 \cdot \mathrm{N}_{\mathrm{A}}=21.5 \mathrm{~cm}^3 \mathrm{~mol}^{-1}\right)$$