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400
Aristotle (B.C.)
VideoProposes a new theory to explain how the four elements of Empedocles and the atoms of Democritus produce the wide range of substances apprehended by our senses. -
465
Democritus (B.C.)
First to propose that matter exists in the form of particles. Coined the term 'atoms'. -
Jan 8, 1215
Robert Grosseteste
Created the first thorough logical analysis of the inductive and experimental proceedures of practical science. -
Jan 8, 1323
William Ockham
Showed the difference between being in motion and being moved. Now called between dynamic motion and kinematic motion. -
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Jan 8, 1543
Nicholas Copernicus
VideoStated the theory that the Sun is a motionless body at the center of the solar system, with the planets revolving around it. -
Zacharias Janssen
Invented the compound microscope. -
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Antoine Lavoisier
Recognized and named oxygen and hydrogen (1783) and opposed the phlogiston theory. -
Joseph Proust
Stated that in chemical reactions matter is neither created nor destroyed. -
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Amedeo Avogadro
Hypothesized that equal volumes of gases at the same temperature and pressure contain equal numbers of molecules. -
Michael Faraday
Discovered that when a wire carrying an electric current is placed next to a single magnetic pole, the wire will rotate. -
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Louis Pasteur
He not only discovered that disease came from microorganisms, but he also realized that bacteria could be killed by heat and disinfectant. -
William Crookes
Studied the effects of sending an electric current through a gas in a sealed tube. -
Henri Becquerel
Discovered radioactivity. -
J.J. Thomson
Discovered the electron. -
Madame Curie
Discovered two radioactive elements, Polonium and Radium. -
Ernest Rutherford
Discovered alpha and beta rays, set forth the laws of radioactive decay, and identified alpha particles as helium nuclei. -
Robert Millikan
Measured the charge on an electron. -
Henry Moseley
Used self-built equipment to prove that every element’s identity is uniquely determined by the number of protons it has. -
Niels Bohr
Developed the Bohr model of the atom. -
Max Planck
Originated quantum theory. -
Erwin Schrodinger
Formulated the wave equation and revealed the identity of his development of the formalism and matrix mechanics. -
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Werner Heisenberg
Discovered a way to formulate quantum mechanics in terms of matrices. -
Georges Lemaître
Proposed the Big Bang theory. -
Louis de Broglie
Best known for his research on quantum theory and for his discovery of wave nature of electrons. -
James Chadwick
Discovered the neutron.
