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History of the Atom
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Helen Urias
History of the Atom
400s B.C
400s B.C
Democritus
He was the first person to identify the possibility of an atom.
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300s B.C
300s B.C
Aristotle
Dismissed Democritus’ atom as “worthless.” Said that the four elements were earth, fire, air, and water
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1803
John Dalton
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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1897
J.J. Thomson
Discovered the electron.
1897
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1909
R.A. Millikan
Determined the charge and mass of an electron through the oil drop experiment
1909
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1927
Werner Heisenberg
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.
1927
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1911
Ernest Rutherford
Said that an atom has a small positive nucleus and the remainder is empty space through the gold foil experiment.
1911
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1930
Erwin Schrodinger
Viewed electrons as a cloud and introduced wave mechanics as a model for the atom.
1930
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1914
Henry Moseley
He stated that the atomic number of an element is equal to the number of protons.
1914
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1932
James Chadwick
Discovered the neutron.
1932
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1923
Louis de Broglie
Worked with Einstein to determine that electrons were similar to particles and waves.
1923
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1922
Niels Bohr
Predicted that electrons travel in energy levels or orbitals.