converting units and ratio problem

The single proton that forms the nucleus of the H atom has a radius of approximately 1.0 x 10^-13 cm. The H atom itself has a radius of approximately 52.0 pm. What fraction of the space within the atom is occupied by the nucleu?
first convert 52.9 pm to cm
52.9 pm (1cm/1x10611pm) = 5.29 x 10^-10 cm
The…