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Dismissed Democritus’ atom as “worthless.” Said that the four elements were earth, fire, air and water.

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Dismissed Democritus’ atom as “worthless.” Said that the four elements were earth, fire, air and water.

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Was the first person to identify the possibility of an atom.

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Was the first person to identify the possibility of an atom.

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Father of modern atomic theory; five parts of his atomic theory including that element’s are composed of atoms are identical in mass.

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Father of modern atomic theory; five parts of his atomic theory including that element’s are composed of atoms are identical in mass.

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Said that an atom has a small positive nucleus and the remainder is empty space. Predicted the existence of neutrons.

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Said that an atom has a small positive nucleus and the remainder is empty space. Predicted the existence of neutrons.

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Predicted that electrons travel in specified energy levels.

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Predicted that electrons travel in specified energy levels.

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Came up with the “uncertainty principle”, which stated that it is impossible to determine the position and momentum of a particle at the same time.

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Came up with the “uncertainty principle”, which stated that it is impossible to determine the position and momentum of a particle at the same time.