Question

Why is the density of nucleus more than that of the atom?

Answer 1

Nuclear density is invariant of the mass of an atom and hence is constant. The average nuclear density of any atom is about,$2.304\times {10}^{17}kg/m^3$

Nucleus consists of neutrons and protons. And every element has a unique atomic number which is equal to number of protons, which leads to the fact that the mass of nucleus will be different and since different mass results in different density hence nucleus of all elements does not have same density. So the density of nucleus more than that of the atom.