# Calculate the void space as a fraction of the volume of the unit cell for FCC and BCC lattices. Calculate the void space for metallic silver crystallizing in the FCC system, the edge length of the unit cell being 4.07 $A^{\large\circ}$. Calculate also the radius of the silver atom.

$0.2596,0.32,17.54\times 10^{-24}cm^3$