_, 3. H In the Thomson model of the atom, the mass of an atom is distributed * . uniformly throughout its volume in a material analogous to pudding (a) . Calculate the density of the \"pudding\" of a gold atom that has a mass of . _ ' 3.27 x 10\"\"25 kg, modeling it as a sphere ;. of radius 0.144 nm. (b) Compare the h .. density in part (a) with the density of an, - alpha particle of mass 6. 64 x 10"\" kg and radius 1.68 x 10 15m