Nuclear Density?

Question

For nuclei larger than Ne, the nuclear radius in Fermis (10-15m) is well-approximated by the formula: R = 1.2 A1/3 wherein A is the total number of nucleons. Assuming all of the atomic mass is in the nucleus, and that the nucleus is spherical, estimate the nuclear density of 89Y.

Answer 1

Since you have the formula for the radius, you can find the volume of the sphere thusly: V = (4/3) * pi * r^3. You will have to convert from m^3 to cm^3, of course.

If you mean element 89, then figure out how many neutrons are in the nucleus (atomic mass - atomic number = neutrons) then calculate the mass of the nucleus (the masses of neutrons and protons should be listed in your textbook). Don't forget to convert to g.

Density = mass/volume.