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•The first stage of an atom looked like small, solid spheres, were indivisible, moved around, and formed different materials by joining together. By Democritus. Source: https://quizlet.com/17737806/six-stages- of-the-atomic-theory-flash-cards/
The second stage of an atom has all substances are made of atoms. Law of Conservation of Matter: Atoms can't be created, divided or destroyed. By John Dalton.
The third stage of an atom in a Cathode ray-tube experiment; discovered electrons. Atoms looked like chocolate chip ice cream. By J.J. Thompson.
The fourth stage of an atom the"Gold foil "shooting gallery;" discovered a nucleus and protons in a atom. By Ernest Rutherford.
The fifth stage of an atom the people first thought electrons traveled in fixed paths; Then electrons could jump from one level to another. By Niels Bohr.
The sixth stage of an atom the people used Uncertainty Principle: exact paths of electrons can't be predicted. Regions where electrons are likely to be found are clouds around nucleus. By Erwin Shrödinger and Werner Heisenberg
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