I'm going to talk about how Ernest Rutherford further developed the atomic theory conducting experiments that further expand the theory.
Rutherford conducted a series of experiments using alpha particles.He aimed alpha particles at solid substances such as gold foil and recorded the location of the alpha particle "strikes" on a fluorescent screen as they passed through the foil.
Through this experiment Rutherford concluded that most of the particles were able to pass through the gold foil without encountering anything large enough to significantly defect their path.
In Rutherford’s Nucleus Paper of 1911 he suggested that the central charge of an atom might be proportional to its atomic mass in hydrogen mass units.
Rutherford created the deduction that an atom could not be a uniform solid but it is an empty space with its mass concentrated in the nucleus.
Rutherford concluded that there were electrons scattered around the dense positively charged center and they were suspended in orbit by the positively charged nucleus, by the electrical forces.
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