Chem Unit 2 SCIENTISTS

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What did Democritus teach us about atomic structure?

“Bowling Ball Model" taught us that all matter is made up of tiny indivisible particles called atoms. 

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JJ Thompson

“Pum Pudding Model” discovered the electron. Taught us that atoms are composed of negatively charged particles (electrons). Also determined charge to mass ratio if an electron.

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Ernest Rutherford

Gold Foil Experiment. Determined the atom is mostly empty space, small positive nucleus, named nuclear model.

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John Dalton

Determined all matter is composed of atoms, atoms of a given element are identical. Atoms cannot be divided, created, nor destroyed.