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Democritus put fourth the idea that atoms existed. He thought that atoms were invisible and were indestructible
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John Dalton discovered that an atom is a sphere. He thought that they were invisible and that all the atoms of an element are identical.
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Thompson discovered electrons. He made the Plum Pudding Model that shows the electrons skattered throughout the spherical cloud of positive charge
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Rutherford fired positivly charged particles at a thin sheet of gold foil. Most of the particles made it through the foil but some didnt. This showed that the atoms are mostly empty space, with a small positive charge at the center: Nucleous.
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Bohr stated that the electrons moved around the nucleus in orbits of fixed sizes and energies.
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Schrodinger discovered that the electron do not move in a set path for it is impossible to know the exact movment of the electrons, but there are clouds of probability called orbitals where you have a better probobility of finding electrons.
