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Aristotle's Discovery - 332 BCE
All things are made up of form and matter which can only be changed with growth, decay, or motion. -
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Democritus' Discovery - 492 BCE
All objects are made up of little indestructible and indivisble things called atoms. -
John Dalton's Discovery
All elements are created from indestructible particles called atoms which are different from other element's atoms. Atoms are the same in same elements though. His theory also introduced compounds, which are made when different elements combine. The final part of his theory was that when atoms of different elements are joined, seperated, or rearranged chemical reactions result. -
J. J. Thompson's Discovery
English physicist who invented the Cathode Ray. This ray resulted in the Thompson/Plum Pudding atomic model. -
Thompson Plum Pudding Model
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Lord Ernest Rutherford Discovery
Conducted a gold foil method. -
Robert Millikan Discovery
Found the charge of an electron to be slightly negative. -
Rutherford's Nuclear Atom
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J.J. Thompson's Discovery #2
Discovereed isotopes as a result of sending ionized Neon through a magnetic and electric field. -
Niehls Bohr Discovery
Came to the conclusion that atoms have a heavily charged nucleus with the electrons at a distance circling around it. -
Bohr Model
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Quantum Wave Model
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Louis de Brogile's Discovery
Studied the stability of the atom. He determined that all forms of energy that were particle and ones that were wavelengths, establishing the wave-length duality of nature. -
Erwin Schrodinger's Discovery
He came up with the Quantum mechanical atomic model which shows the orbitals around the nucleus in constant motion, equidistant from each other and at different angles. -
Werner Heisenberg's Discovery
He realized that there are many things about atoms which cannot be exactly determined or calculated. This is mainly directed at determining an electrons location and velocity at the same time.
