Scientists

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Last updated 1:54 AM on 6/28/26
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4 Terms

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John Dalton

1803, Atomic Theory, Based on observations of chemical reactions

Matter is made of atoms

Atoms of the same element are identical

Atoms combine in whole number ratios

All matter is made of indivisible, indestructible atoms

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J.J. Thomson

1897, Electrons discovered, Cathode Ray Tube (CRT)

Negative particles (electrons) are inside atoms. Proposed the plum pudding model.

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Robert A. Millikan

1909, Charge of the electron, Oil drop Experiment

Measured the electron’s charge by balancing tiny oil drops between charged plates

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Ernest Rutherford

1911, Nucleus Discovered, Gold Foil Experiment, Most of the atom is empty space, with a small, dense, positively charged nucleus