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Democritus (Ancient Greece): matter is made of smaller versions
Atomos = indivisible
Matter cannot be created nor destroyed
John Dalton (1880's): All matter made of atoms, like SPHERES
JJ Thompson (1880's): Used cathode ray to discover ELECTRONS
The PLUM PUDDING model!
Ernest Rughetrford (1909): Gold foil experiment to discovered PROTONS and NUCLEUS
Nucleus has POSITIVE PROTONS
Electron Orbits Around Nucleus, like the planets
Niels Bohr (1911): Calculated and created the orbital theory of electrons
Werner Heisenberg (1950's): Proposed cloud theory to predict where electrons could be
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