Question

relative size of hydrogen atom

Answer 1

Above right is an image from Wikipedia showing the diameter of the proton in a hydrogen atom (1.7 x 10-5 Å) and the diameter of the atom itself which is the orbital shell of the electron (1.1 Å). For those of you unfamiliar with angstroms (Å), one angstrom is equivalent to 10-10 meters.

Answer 2

A hydrogen atom is an atom of the chemical element hydrogen. The electrically neutral atom .... be in certain, discrete circular orbits or stationary states, thereby having a discrete set of possible radii and energies.