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Henri Becquerel 16 Discovered radioactivity Radiation produced spontaneously by unstable atomic nucleus Thomson's Atom 17 Discovered electrons Plum Pudding model (for us Americans it looks like a chocolate chip cookie model) Electrons charge charge "pudding" Rutherford's Atom 1909 discovered dense positively charged nucleusHenri Becquerel Antoine Henri Becquerel () was a French physicist and winner of the 1903 Nobel Prize in Physics Becquerel was born in Paris, France on He was the son of a professor of applied physics, Alexander Becquerel He began his studies in 1872 at École Polytechnique just south of ParisThe discovery of radioactivity in uranium by French physicist Henri Becquerel in 16 forced scientists to radically change their ideas about atomic structure Thomson's Experiment Thomson's experiments with cathoderay tubes showed that all atoms contain tiny negatively charged subatomic particles or electrons Radioactivity How Was Radioactivity Discovered ...