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Atoms are "uncuttable"
440 BCE Photo credit to wikispaces. -
Atoms are small, hard particles. Photo credits to wikipedia.
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Atoms of different elements are different. Photo Credit : wired.com
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Conducted the gold foil expirement. Photo credits to paultadich.com
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Electrons travel in certain paths, or energy levels. Photo Credits to travelingatom.com
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Electrons path cannot be predicted. 20th century. Photo credits to hoover.org