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415 B.C. The first person to come up with theory that different kinds of atoms have different shapes. Also realized that matter was made up of small individual atomos.
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353 B.C. Disagreed with Democritus' theory. Aristotle's theory said that matter could be divided an infinite number of times.
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First person to make good use of a balance. He also proposed the Combustion Theory and named oxygen and came up with the Law of Conservation of Mass.
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Joseph proposed the Law of Constant Composition.
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Did many experiments with different chemicals. With these experiments he came up with the atomic theory.
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Proposed the Avagadro's Hypothesis that stated that at the same temperature and pressure, equal volumes of gases contain the same number of molecules or atoms.
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Charles Goodyear patented the first vulcanized rubber soccer ball in this year.
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The modern version of the game was standardized by the English on this date.
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On this date many soccer clubs got together and formed the first major soccer club.
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The first class of students from Iowa State University graduated this on year.
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Studied cathode ray tubes which are negatively charged. By studying these he learned about deflection of cathode rays by magnetic fields.
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He discovered that uranium containing minerals produced x-ray radiation.
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On this date Utah was admitted as the 45th U.S. State.
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Discovered the electron and made a structure for them. He knew that electrons had a negative charge so he came to the conclusion that matter had a positive charge.
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She studied uranium and thorium and called the spontaneous decay process "radioactivity". She and her husband discovered the radioactive elements polonium and radium.
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Discovered the quanta. He noticed that when atoms vibrate long enough you can measure their energy only in discrete units called quantas.
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He published the famous equation E=mc2 and the Theory of General Relativity.
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Robert determined the charge of an electron using his oil drop apparatus.
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He realized that atoms must get scattered by small pieces of positively charged matter. So he concluded that electrons must exist somewhere. Then in 1920 he discovered the name proton.
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He concluded that the atomic number was equal to the positive charge of an atom.
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He made a more accurate model of the atom.
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He introduced that wave/particle durality of matter.
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He came up with the Heisenberg Uncertainty Principle which takes away the idea of electrons traveling around in neat orbits. Any electron that is subjected to photons will have its momentum and position affected.
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Used Brogile and other's ideas and made an equation. Solving the equation can predict the properties and reactivities of all atoms and molecules.
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James discovered the neutron. He also proved that neutrons, neutral particles in the nucleus made up approximately half the mass of an atom, actually did exist.
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The attack on pearl harbor by Japanese Imperial General Headquarters.
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The first computer was made at Iowa State University.
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Radium E. becomes the radiactive element to be made synthetically.
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The 5th Winter Olympic began in St. Moritz, Switzerland.
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The Korean war started on this date and ended on July 27, 1953.
