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500 BCE
Plato
Founded the Academy, an academic program which many consider to be the first Western university. -
405 BCE
Democritus
Developed the concept of the atom. They thought everything was made up of atoms. -
400 BCE
The Alchemists
Tried to transform base metals such as lead or copper into silver or gold. -
330 BCE
Aristotle
Aristotle made pioneering contributions to all fields of philosophy and science. He invented the field of formal logic -
300 BCE
Solar System model
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Robert Boyle
Carried out experiments to investigate the properties of air and the vacuum they used glass tubes to find this out. -
Lavoisier
Lavoisier discovery of the role oxygen plays in combustion. He recognized and named oxygen in 1778 and hydrogen 1783. -
John Dalton
When oxygen is combined with either one or two volumes of nitric oxide in closed vessels over water. -
Solid Sphere of "Billiard Ball" Model
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Robert Millikan
Robert Millikan was a physicist, and discovered the elementary charge of an electron using the oil-drop experiment -
Dmitri Mendeleev
Mendeleyev is best known for his discovery of the periodic law -
The Curies
discovery of radium and polonium, and her huge contribution to finding treatments for cancer. -
J.J. Thomson
Thomson announces the discovery of electrons -
Planck's Quantum Theory of Light
Planck postulated that the energy of light is proportional to the frequency -
Plum Pudding Model
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Photoelectric Effect
The photoelectric effect was made by Albert Einstein. A photoelectric effect is emission of electrons when electromagnetic radiation, such as light, hits a material. -
Ernest Rutherford
postulated the nuclear structure of the atom, discovered alpha and beta rays. -
Neils Bohr
proposed a theory for the hydrogen atom, based on quantum theory that some physical quantities only take discrete values. -
Albert Einstein
Made the general theory of relativity. -
Electron Cloud Model
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Schrodinger Equation
Schrodinger equation gives the evolution over time of a wave function -
Werner Heisenberg
Developed a key piece of quantum theory, the uncertainty principle, with profound implications. -
James Chadwick
James Chadwick discovery was the neutrons