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Dismissed Democritus’ atom as “worthless.” Said that the four elements were earth, fire, air and water
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Viewed electrons as a cloud and introduced wave mechanics as a model for the atom
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Father of modern atomic theory; five parts of his atomic theory including that elements are composed of atoms and that element’s atoms are identical in mass.
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Discovered the electron
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Said that an atom has a small positive nucleus and the remainder is empty space through the gold foil experiment
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Determined the charge and mass of an electron through the oil drop experiment
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He stated that the atomic number of an element is equal to the number of protons in the nucleus.
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Predicted that electrons travel in specified energy levels.
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He was the first person to identify the possibility of an atom.
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Worked with Einstein to determine that electrons were similar to particles and waves
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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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Discovered the neutron
