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Democritus thought you would end up with a particle that could not be split.
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Scientists learned that elements combine in certin proportions based on mass to form compounds.
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Dalton published his atomic theory
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In the late 1800's scientists agreed that Daltons theory explained much of what they saw but not all.
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In 1897 J. J. Thomson showed there was a mistake in daltons theory thomson discovered small particled inside the atom.
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In 1900 Max Planck, a professor of theoretical physics in Berlin showed that when you vibrate atoms strong enough, such as when you heat an object until it glows, you can measure the energy only in discrete units. He called these energy packets, quanta.
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Ernest nRutherford decided to test thomsons theory
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Rutherford revised the atomic theory
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In 1924 a Frenchman named Louis de Broglie thought about particles of matter. He thought that if light can exist as both particles and waves, why couldn't atom particles also behave like waves?
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In 1926 the Austrian physicist, Erwin Schrödinger had an interesting idea: Why not go all the way with particle waves and try to form a model of the atom on that basis?
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In 1926, a German physicist, Max Born had an idea about 'psi'. Born thought they resembled waves of chance. These ripples moved along waves of chance, made up of places where particles may occur and places where no particles occured.
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scientists found that electrons do not move in definate paths
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In 1913 Niels Bohr proposed electrons move around the nucleus in paths.