If you were to make a scale model of the hydrogen atom and decided the nucleus was to have a diameter of 1mm, what would the diameter of the entire model be?
The diameter of the entire model would be 6 m.
The diameter of a proton is
The Bohr radius — the most probable distance from the nucleus to the electron — is
The diameter of a hydrogen atom is therefore
If the diameter of the model nucleus is 1 mm, then