1 Jan 1911 Jahr - Geiger, Marsden, and Rutherford discovered the nucleus in 1911 following experiments to test the 'Plum Pudding' model. They fired beams of alpha particles at a thin piece of gold foil, expecting them to pass through. Many did, but some alpha particles were deflected and others bounced straight back. This, they discovered, was because the positively charged nucleus was in the way.
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1 Jan 1911 Jahr
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~ 114 years ago