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Thomson proposed that an atom consist of protons and electrons in a sort of "pudding." However, Ernest Rutherford showed that a beam of positively charged alpha-radiation could be scattered by thin gold foil which showed that an atom is mostly empty space with a small positively charged nucleus to deflect alpha-particles. Thus Rutherford proposed that the electrons orbited the nucleus (but did not fall into it) like planets.1a
The line emission (and absorption) spectra of gases were also another important area of research that would prove useful to explaining the nature of the atom. Johannes Rydberg had found an equation to explain the line spectra of Hydrogen by developing the Rydberg Equation...
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