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500
Democitus
Wikipedia
Considered the father of modern science, Democritus deduced with help from his mentor, Leucippus, everything was composed of "atoms". -
500
Aristotle
Wikipedia
Aristotle believed everything was made out of four elements - Earth, Air, Water, and Fire. He and Democritus challenged eachother's theories, but Aristotle's theory won out in the end and was valid for nearly 900 years afterwards! -
Period: 500 to
Scientists that contributed to Atomic Theory
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John Dalton
Wikipedia
Dalton is famous for his work and essays about and in partial pressures and the pressure put upon gasses and gaseous mixtures, that helped assist atomic theory with Gay-Lussac's Law of combining gasses. -
Henri Becquerel
Wikipedia
Along Pierre et Marie Curie, Henri helped in the discovery of radioactivity and radioactive elements. -
Marie et Pierre Curie
Wikipedia
Marie Curie is known for her Nobel Peace Prize-winning work in atomic theory and radioactive elements. Marie discovered Polonium, and her husband Pierre assisted her in her efforts. -
J.J. Thomson
Wikipedia
Thomson is credited for the discovery the electron, and of elemental isotopes. In 1906 he won the Nobel Prize for his work with the conduction of electricity in gasses, and magnetic reflection of cathode rays. -
Ernest Rutherford
Wikipedia
Rutherford is noted for his discovery of certain elements' half-lives, and the existance of such. He also differentiated between the alpha and beta particles in an atom, and the first sucessful 'splitting of an atom' in 1917. -
Robert Millikan
Wikipedia
Millikan is noted for his research in atomic theory, in particular his study on the charge of an electron, and the discovery of the value of a mole, or Avagadro's Number. -
Niels Bohr
Wikipedia
Bohr recieved a Nobel Peace prize for his contributions to understanding atomic structure and quantum mechanics. Bohr proposed the model of the atom in which electrons orbit the nucleus like the planets orbit the sun. -
James Chadwick
Wikipedia
James Chadwick is known for his discovery of the particle in the nucleus of the atom, the "neutron".
