physics question...hard!!!!?

Question

what percentage of the volume of a hydrogen atom is protons? assume the atom is a sphere and the volume of a sphere is 4/3(pi)r^3

Answer 1

find the radius of a hydrogen atom, and that of a proton. divide the volumes and multiply by 100%

Answer 2

This is hard to answer, since the electron in the atom is in an orbital which represents the highest probability volume of where the electron could be. Thus, we don't know for a certainty what the radius of the sphere is. We do know that the volume occupied by the proton is extremely small compared to that of the mean size of the 1s orbital.