chem unit 3

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Last updated 12:33 PM on 10/9/26
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6 Terms

1
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Democritus

Coined "atomos", believing matter is made of indivisible particles.

2
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John Dalton

  • Proposed the Billiard Ball Model (atoms are blank, spherical balls).



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J.J. Thomson

Used the Cathode Ray Tube experiment to discover electrons (negative charge). He created the Plum Pudding Model (negative electrons scattered in a positive sphere).

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Robert Millikan

  • Conducted the Oil Drop Experiment to find the exact charge of an electron (\(1.6 \times 10^{-19}\) Coulombs) and calculate its tiny mass.


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Ernest Rutherford (1911):

Fired alpha particles in the Gold Foil Experiment. He discovered the nucleus—a dense, positively charged center where most mass sits, surrounded by orbiting electrons.

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James Chadwick

: Discovered the neutron because subatomic masses and charges did not add up.