Calculate the density of a (7,3)Li atom (with a radius of 152 pm) and of its nucleus. Explain your results in the context of the nuclear model. Assume that the radius of a proton is 1.2 fm.
The most compelling evidence that nucleons are closely packed in a nucleus is that the radius of a nucleus, r, is found to be given approximately by r = r0A1/3, where r0 = 1.2 fm and A is the mass number of the nucleus.
