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340
Democritus proposed the existence of indivisible atoms
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May 9, 600
Concept that atoms existed in ancient India in the 6th Century
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Development of the Microscope
Scientists observed the small scale structure of elements. -
Eugene Goldstein's discovery that atoms dad positive charges
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J.J Thomson discovers the "electron"
scientific curiosity: Cathode Rays -
J.J Thomson's scientific curiosity: Cathode Ray Tube
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Rutherford's experiment with radioactive alpha particles
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Ernest Rutherford discovers and names the "proton"
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Rutherford's revolutionary view of the atom
That an atom consisted of a small, dense core of positively charged particles in the middle (nucleus) and surrounded by swirling electrons. -
James Chadwick discovered the neutron