Grade 9 Chemistry
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Last updated 10:52 PM on 12/11/24
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6 Terms
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Democritus
Greek philosopher who proposed that all matter can be divided into smaller pieces until an indivisible particle is reached.
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The Billiard Ball Model
John Dalton's model that explained many properties of matter.
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Plum pudding model
J.J. Thomson's model of the atom, where electrons are embedded.
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Gold Foil Experiment
Ernest Rutherford's experiment that revealed a dense, positively charged nucleus.
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James Chadwick
Scientist who discovered the neutron.
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Neils Bohr
Proposed that electrons orbit the nucleus in fixed paths.
