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Aristole developed the scientific method. he developed this theory between the yeard 384-322 B.C. The scientific method was developed to explain Aristotles theories and experiments he came up with.
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Also one of the founders of the atomic theory. Democritus believed that "there are smallest indivisible bodies from which everything else is composed, and that these move about in an infinite void space."( http://plato.stanford.edu/entries/democritus/)
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John Dalton is known for his work on the development on the atomic theory, He did experiments with different temperatures, gasses, vapours and pressures. THis was invented to help better understant his theories.
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Discovered radioactivity while investigating uranium salts in 1896. He also recieved 3 Nobel Peace Prizes.
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He helped discover the electron and isotopes. He discoverred this through the cathode rays. He also said that rays were made up of very light and negatively charged particles that were blocking the atoms.
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IN 1908 he was awarded a Nobel Prize in Chemistry "for his investigations into the disintegration of the elements, and the chemistry of radioactive substances"(http://en.wikipedia.org/wiki/Ernest_Rutherford) He founded two types of radiation called thorium and uranium in his experiment.
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Discovered the measurement of a charge in an electron. While working on an oil drop experiment on an electron, he found the charge-to-mass ratio on the electron and found the measurement.
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Made contributions in understanding the atomic structure and quantum mechanics. He developed the atomic stucture from Rutherford's structure and developed the quantum mechanics from a model of the structure.
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The Quantum model is a model that has the area an atom might be located. It has a nucleus containing nuetrons and protons. This was developed in 1925 by two men named C.J. Davisson and I.H Germer.
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James discovered the nuetron. In 1932 he discovered an unknown particle by the lack of electric charge in the atomic nucleus.
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Marie and Pierre Curie discovered Polonium and Radium. They discovered this by studying the field of radiology.
