In 1911 Rutherford Used a Radium Bromide alpha particle source (He++) and formed it into a beam. As most passed throught he foil with out deflection most of the atom was empty space (?) The one in 10,000 that deflected of a + charged nucleus.
The above are spectral lines of Hydrogen. Use E =hf to analyse the importance of this spectrum.
Research Bohrs Postulates.
