Atom, First used by the ancient Greeks. It means invisible, The Plum Pudding Model 1890, This is what JJ Thomson thought atom's looked like: A ball of positive protons with negative electrons spread throughout., Geiger and Marsden 1909, The scientists who disproved the plum pudding model using their gold foil experiment., Rutherford 1911, The first scientist to redraw the what an atom looks like to the nuclear model., Bohr 1913, Came up with the idea that electrons orbit the nucleus in shells., Chadwick 1932, Discovered the neutron, The Nuclear Model, the model we used to show what an atom looks like., JJ Thomson 1890, Discovered that there were things even smaller than atoms. Sub atomic particles (protons and electrons), Peer review, Every scientist has to have their work checked by other scientists to make sure their results and conclusions are valid., Gold Foil Experiment, This proved that an atom has most of its mass in the centre and not evenly spread out as Thomson suggested.

Atomic Structure Timeline

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