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400
Democritus
BC
Matter is made of small, indivisible particles that have different forms, positions, and arrangements. Democritus named these particles, atoms. -
Oct 25, 1214
Rodger Bacon
Taught that in order to understand the natural universe there must first be observation, allowing for evidence to come from the natural world. -
John Dalton
Developed an atomic theory stating that spherical atoms had measurable properties of mass. -
Michael Faraday
Split molecules with electricity by means of electrolysis, developed laws of electrolysis. -
J. Plucker
Built the first cathode ray tube, used for gas discharge. -
Sir William Crookes
Studied the properties of cathode rays and found that they exhibit negative charge and mass. -
Pierre Curie
While working on radioactive substances, Curie discovers gamma rays. -
Albert Einstein
Publishes theory on special relativity and states that matter can be converted into energy. -
R.A. Millikan
Millikan performed an oil drop experiment to determine the charge and the mass of an electron to be 1.602 x 10-19 C and 9.11 x 10-28 g respectively. -
Errnest Rutherford
Ernest was the first to do an artificially induced nuclear reaction. Used nitrogen and alpha particles to obtain an oxygen isotope and protons. -
Werner Heisenberg, Max Born and Erwin Schodinger
They all developed quantum mechanics. -
Werner Heisenberg
Werner created the Principle of Indeterminacy which states that you can not know the both the position and the velocity of a particular particle at any one moment in time. -
Paul Dirac
Paul suggested that anti-particles existed. He found the first anti-electron, positron. -
James Chadwick
Discovered neutral atomic particle with similar mass to a proton, the neutron by using alpha particles. -
Aristotle
Gathered all theories up to date and was responsible for formalizing the knowledge into one idea. Aristotle was leery that Democritus’s atoms didn’t account for the great variance of matter.
