Fill in the blanks in the table below. Each row is a different isotope of an element.

$\backslash$table$[[\backslash$table$[[$Complete$],[$Symbol$]],$Protons,Neutrons,Electrons,$\backslash$table$[[$Atomic$],[$number$]],\backslash$table$[[$Mass$],[$Number$]]],{[}^{72}Ge,,,,,],{[}^{56}M{n}^{3+},,,,,],[,,,,,],[,,46,36,,80]]$

Consider at atom of ${?}^{64}Zn$ :

$($a$)$ Calculate the density of the nucleus in $\frac{g}{c}{m}^3$ knowing that the nuclear radius is $4\mathrm{.}8{10}^{-6}nm$ and the mass of the ${?}^{64}Zn$ atom is $1\mathrm{.}06{10}^{-22}g.[$volume of a sphere $=(\frac{4}{3})r^3]$

$($b$)$ Calculate the density in $\frac{g}{c}{m}^3$ of the space occupied by the electrons in the zinc atom, given that the atomic radius is $0\mathrm{.}125nm$ and the mass of a single electron is $9\mathrm{.}11{10}^{-28}g.$ Assume the zinc atom is neutral.

$($c$)$ Having calculated these densities, what statement can you make about the relative densities of the parts of the atom?