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Atomic Timeline (Democritus-440 BCE (Atoms are small, hard particles,…
Atomic Timeline
Democritus-440 BCE
Atoms are small, hard particles
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Thomson-1897
There are small, negatively charged particles (electrons) inside an atom
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Rutherford-1909-1911
Most of an atom's mass is in the nucleus. It is small, dense, and positively charged
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Bohr-1913
Electrons travel in specific paths, or energy levels
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