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Declaration of Independence
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Joseph Proust
He created a law called The Law of Constant Composition that states that a pure compound has elements that will combine in definite porportions of masses. -
John Dalton
He pictured that atoms were tiny spherical particles that can not be destroyed. In his picture the particle did not have an internal structure. -
War of 1812
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Steel Plow Invented
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Transcontinental Rail Service in America
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Eiffel Tower
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Henri Becquerel
He discovered the radioactivity by accident. One of his partners on this experiment was Marie Curie. -
J.J. Thomson
He was the first to discover the electron, which led to his plum-pudding model. This model was a positive charged sphere with electrons imbedded into it. -
THOMSON PLUM-PUDDING MODEL
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Max Planck
He created a newer theory of radiation, where the energy is released is equal to his constant multipled by the wavelength. -
First Helicoptor Flys
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Ernest Rutherford
In his experiment he found out that most of the area in an atom was empty space. Discovered that almost all mass was located in the nucleus. -
RUTHERFORD MODEL
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Neils Bohr
In his model of the atom, the electrons moved in circular paths around the nucleus. Each level has a fixed distance from the center. -
BOHR MODEL
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WWI
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Robert Millikan
He found out the quantity of charge an electron has using J.J. Thomson's charge to mass ratio. The values that he found are very close to the values that are accepted today. -
QUANTUM MECHANICS MODEL
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Louis de Broglie
He proposed that electrons particles have similar charateristics to waves and with in a couple of years there was experimental evidence to support it. -
Werner Heisenberg
He stated that in quantum mechanics we can not know the velocity and position of an electron at the same time. -
Erwin Schrödinger
In his work he developed mathmatical equations that described the path of electrons which led to the electron cloud model. -
James Chadwick
He was the first to explain the existence of neutrons in the nucleus. The neutrons he discovered have a neutral charge. -
WWII
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Apollo 11
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Reagan Election
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Period: to
2500 equals 500 B.C. and 2000 equals Year Zero
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Aristotle (life 384-322 B.C.)
He was against Democritus's ideas stating that the earth would fall apart if Democritus was right. He believed the earth consisted of dryness, wetness, heat and cold. -
Democritus (Life 460 - 370 B.C.)
His theory was that everything was made up of atoms. He was the first to state that they were invisible and indestrutible but there was a lacking of experimental support. -
DEMOCRITUS MODEL
