jan 7, 1899 - Ernest Rutherford

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Observation: He used alpha particles and fired them into gas atoms- a few violently deflected: implies a dense positively charged center that contains most of the atomic mass
Conclusion: He postulated the nuclear structure of an atom and discovered alpha and beta rays Contribution: He made discoveries in radioactivity and nuclear physics

https://www.britannica.com/science/Rutherford-atomic-model

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