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460
Democritus
B.C.
Democritus came up with the theory that everything in the world is composed of atoms. His theory included several aspects about atoms. They are physically indivisible, empty space lies between atoms, and that atoms are and always will be in motion. He also believed there are an infinite amount of different atoms that differ in size and shape. -
Issac Newton Publishes of the Philosophiæ Naturalis Principia Mathematica
This book describes Newton's three laws of motion. -
First self powered automobile
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Joseph Proust
Created the law of definite proportions which is the law that states that any chemical compound contains exactly the same proportions of an element to the mass of the compound. -
John Dalton
He claimed the reason elements combined was because all elements are made up of atoms. He also created a 3 part atomic theory. First, all particles are made of atoms, they cant be divided or destroyed. Second, atoms of the same elements are identical and diferent element's atoms are different. Third, atoms join with other substances to create new and different substances. -
Edison creates the first light bulb
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J.J. Thomson
Thompson discovered that all atoms contain particles, now known as electrons. Thomson made this discovery with his research with cathode rays. He found that the rays could be deflected by an electric field. He compared the deflection of the beams to the electric and magnetic fields to discover the rays mass, which proved the rays were matter. -
Max Planck
Planck came up with the quatum theory. This theory stated that energy did not flow in a steady line, but was delivered in what Planck called quanta. His quatum theory gave science a better understanding of the interactions of matter and radiation. -
Henri Becquerel
Henri Becquerel, Marie Curie, and Pierre Curie won the Nobel Prize for the discovery of radioactivity. Radioactivity relates to the spontaneous discharge of atomic particles by an element. -
First toaster invented
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Ernest Rutherford
Rutherford contributed to the history of chemistry with an experiment where he shot a beam of positively charged particles at a sheet of gold foil. He had thought that the atoms would be soft, like in Thompson's plum pudding model, and expected them to pass through the sheet and continue straight. Most of the particles did, but some were reflected back. This led Rutherford to create his own model, where there was a small positively charged nucleus with negative electrons orbiting around it. -
Robert Millikan
Robert Millikan measured the charge of an electron. He also won a Nobel Prize in 1923 for his work. -
Niels Bohr
Bohr suggested that electrons travel around the nucleus in defined paths that were certain levels away from the nucleus. He also said that the electrons must be on one of the paths, but can jump between the paths. -
The NFL is formed
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Louis de Broglie
Louis de Broglie wrote a doctoral thesis that introduced the theory of electron waves. His research became the de Broglie Hypothesis that said any moving particle or object has an associated wave. This theory created the wave mechanics field in physics. -
Werner Heisenberg
Heisenberg, with Max Born and Pascual Jordan, made the matrix formulation of quantum mechanics. He received a Nobel Peace Prize for creating quantum mechanics and for its application to the discovery of the allotropic forms of hydrogen. -
Erwin Schrodinger
Erwin Schrodinger publishes the Schrödinger equation, which revolutionizes quantum mechanics in physics and chemistry. He receives a Nobel Peace Prize for his work in quantum mechanics. -
First practical use of the Television
Germany broadcasts the Olympic games. -
James Chadwick
James Chadwick discovers the electrically neutral part of an atomic nucleus, the neutron. Neutrons are able to split an atom without being repelled by electrical forces in a nuclei. -
World War 2 begins
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First McDonald's opened
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Martin Luther King Jr. gives his "I Have a Dream" speech
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Atari releases Pong
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Obama is inagurated
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Aristotle
B.C.
Aristotle beleived matter was made of one of four different elements. These elements were Earth, Fire, Water, and Air. He thought when these elements were out of there natural place, the had a natural motion with no external cause.
