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350
Aristotle
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. -
400
Democritus
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. -
Antonine Laviosier
Lavoisier was a French nobleman that founded several elements and put the first table of elements together. -
Joseph Louis Proust
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. -
John Dalton
John Dalton was an English chemist that created the Atomic Theory of Matter, a composition of previous findings by Democritus and his own findings. -
Michael Faraday
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. -
Henri Becquerel
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. -
Marie and Pierre Curie
Marie and Pierre Curie were a European couple that contributed to atomic chemistry by exploring the mysteries of radioactivity. -
Max planck
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. -
Albert Einstein
He produced perhaps one of the most famous equations ever: E = mc² (energy equals mass multiplied by the speed of light squared). -
Robert Millikan
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. -
Rutherford
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 -
Niels Bohr
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. -
James Chadwick
James Chadwick was an English scientist that discovered the neutron. Before this discovery, Rutherford had concluded that the nucleus was made of positive matter -
J.J Thomson
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.
