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Dalton thought that atoms were indestructible balls without an internal structure.
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Discovered the electron. After which he developed the plum pudding model.
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Discovered that the energy in light is directly proportional to the frequency.
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Found that the nucleus is a dense, positively charged ball in center of an atom.
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Bohr created a model in which electrons move in fixed orbits about the nucleus like planets around the sun.
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Carried out experiments to find the quantity of charge carried by an electron. Using the value he obtained in his experiments he then used the charge-to-mass ratio developed by Thompson, He was then able to figure out the mass of an electron.
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Broglie proposed that particles like electrons have some properties of waves. Experimental data supports this theory.
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Schrodinger develops equations that predict the motion of electrons in an atom, leading to the development of the Electron Cloud Model (Quantum Mechanic Model).
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Created the Heisenberg Uncertainty Principle, which states that it is impossible to know the velocity and position of a sub-atomic particle at the same time.
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Chadwick confirmed the existence of neutrons in the nucleus of the atom.
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