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The Democritus Atomic Theory revolves around the atoms that are present in the atmosphere.
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Democritus was a Greek philosopher, and therefore, never backed up any ideas with experimentation. Dalton's approach to science involved experimentation and measurements and the attempt at explaining what he observed
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He discovered the electron in an atom while studying "cathode rays".
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Rutherford was a scientist who discovered established the nuclear structure of the atom and the essential and nucleus.ature of radioactive decay as a nuclear process.
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James Chadwick proved the existence of the neutron in 1932 which is what accelerated the research in nuclear physics greatly.
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Among other things he postulated that all particles have a wave nature.
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The electron cloud model was invented throughout the 20th century. (1900's) Yet after neils bohrs model in 1913
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Bohr's theory of the atom and its quantum structure.
The theory of complementarity, which helps explain wave/particle duality -
He was not able to see how atoms could stay in perpetual motion and he developed a theory based upon the four elements. He claimed Aristotle’s theory made a great generalization off all matter being made of the four elements: fire, water, earth, and air.