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BC
Matter is made of small, indivisible particles that have different forms, positions, and arrangements. Democritus named these particles, atoms. -
Taught that in order to understand the natural universe there must first be observation, allowing for evidence to come from the natural world.
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Developed an atomic theory stating that spherical atoms had measurable properties of mass.
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Split molecules with electricity by means of electrolysis, developed laws of electrolysis.
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Built the first cathode ray tube, used for gas discharge.
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Studied the properties of cathode rays and found that they exhibit negative charge and mass.
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While working on radioactive substances, Curie discovers gamma rays.
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Publishes theory on special relativity and states that matter can be converted into energy.
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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.
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Ernest was the first to do an artificially induced nuclear reaction. Used nitrogen and alpha particles to obtain an oxygen isotope and protons.
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They all developed quantum mechanics.
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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.
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Paul suggested that anti-particles existed. He found the first anti-electron, positron.
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Discovered neutral atomic particle with similar mass to a proton, the neutron by using alpha particles.
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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.
