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Aristotle (350 B.C.) disagreed with Democritus's model of the atom in Aristotle was a Greek philosopher. Many of his ideas were more thought based than scientifcially based.
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Democritus was the first scientist to create a model of the atom. He was the first one to discover that all matter is made up of invisible particles called atoms.
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Lavoisier was a French nobleman that founded several elements and put the first table of elements together.
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Joseph Louis Proust was a French chemist. He was best known for his discovery of the law of constant composition in 1799, stating that in chemical reactions matter is neither created nor destroyed.
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John Dalton was an English chemist that created the Atomic Theory of Matter, a composition of previous findings by Democritus and his own findings.
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Michael Faraday, FRS was an English scientist who contributed to the fields of electromagnetism and electrochemistry. His main discoveries include those of electromagnetic induction, diamagnetism and electrolysis.
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Henri Becquerel was born into a family of scientists. With influences from his father and grandfather, Bequerel worked with properties of the atom, such as magnetism and radioactivity.
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Marie and Pierre Curie were a European couple that contributed to atomic chemistry by exploring the mysteries of radioactivity.
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Max Planck was a german scientist that created the Quantum Theory. In this theory, Planck stated that energy was given off in little packets of energy.
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He produced perhaps one of the most famous equations ever: E = mc² (energy equals mass multiplied by the speed of light squared).
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Robert Millikan was an American scientist that was very interested in J.J. Thomson's finding of the electron. J.J. Thomson predicted that the electron was 1000 time smaller than the atom.
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He felt that J.J. Thomson's model was incorrect, so he created a new one. He created the nucleus, and said that instead of the positive matter being the whole atom
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Niels Bohr was a Danish scientist that was a student of Rutherford. He decided to make a new model based off of Rutherford's model, but changed the orbit of the electron.
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James Chadwick was an English scientist that discovered the neutron. Before this discovery, Rutherford had concluded that the nucleus was made of positive matter
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Up until his time, all models of the atom looked like a big solild ball. J.J. Thomson discovered the electron, which led him to create the "plum pudding" atomic model.
