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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