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ATOMISM

ATOMISM. Theory by Democritus and Leucippus Objects in the universe are composed of very small atoms Indestructible building blocks Not indestructible Believed hidden substances in all physical objects consists of different arrangements of atoms. FOUR ELEMENTS.

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ATOMISM

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  1. ATOMISM • Theory by Democritus and Leucippus • Objects in the universe are composed of very small atoms • Indestructible building blocks • Not indestructible • Believed hidden substances in all physical objects consists of different arrangements of atoms.

  2. FOUR ELEMENTS • Aristotle came up with the idea that there were four different types of atoms. They were earth, wind, fire , and water. • They did not have scientific experiments . It was more of a philosophy.

  3. SOLID SPHERE MODEL • John Dalton viewed the atom as a small solid sphere. • Each element was composed of the same kind of atoms. • Each element was composed of different kinds of atoms. • Compounds are composed of atoms in specific ratios. • Chemical reactions are rearrangements of atoms (mass is conserved).

  4. PLUM PUDDING MODEL • J.J. Thomson in the Cathode Ray Experiment concluded that the particles inside were all negatively charged. This led to the development of the Plum Pudding Model • The plum pudding model of the atom was proposed by J. J. Thomson , who discovered the electron in 1897. • Then later Thomson proposed the plum pudding model in 1904.

  5. GOLD FOIL EXPERIMENT • Ernest Rutherford • EXPERIMENT: he fired alpha particles at a very thin gold foil. • Shocking result: rather than all the particle passing straight through the foil, many were scattered off at different angles, some came straight back. • Electrons orbited the empty space around the nucleus.

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