Density of nuclear matter is the ratio of mass of nucleus and its volume.
Let ‘m’ be the average mass of a nucleon and ‘R’ is the nuclear radius.
Mass of the nucleus = mA ; A = mass no. of the element
Volume of the nucleus = \(\frac{4}{3}\pi r^3\)

As m and R0 are constants, density ρ of nuclear matter is the same for all elements.