Polonium (Po) is the only element known to take on the simple cubic crystal system. The distance between nearest neighbor Po atoms in this structure is 335 pm.

(a) What is the diameter of a Po atom?

(b) What is the density of Po metal?

(c) At what angle (in degrees) to the parallel faces of the Po unit cells would first-order diffraction be observed when using X-rays of wavelength 1.785 x 10^-10 m?