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jun 1, 1910 - Discovery of Nucleus: The nucleus was discovered in 1910 by Leiger and Marsden. In their experiment they fired positively charged particles (alpha particles) at the thinnest piece of gold they could make. They expected the particles to pass through the cloud of positive charges as proposed by Thomson. This didn't happen. Some of the particles were repelled backwards. This proved the plum-pudding model wrong. Rutherford therefore suggested in 1911 that the positive charges are concentrated at the atom

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Discovery of Particles

Date:

jun 1, 1910
Now
~ 108 years ago

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