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Dalton theorized that all matter was made up of atoms, indestructible and unchangeable. All atoms of a single element are identical, but other elements have atoms of different shapes and sizes.

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Thomson theorized that there are positive and negative electrons inside an atom.

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Studied radiation emitted from uranium and thorium and named them alpha and beta. He also discovered the nucleus.

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He developed an explanation of atomic structure that underlies regularities of the periodic table of elements.

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The theory pretty much is that an atom is has a dense nucleus with surrounded by a cloud of electrons with various orbits.

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Matter is made of atoms that are indivisible and indestructible and that all atoms of a single element are identical. He didn't really do any experiments, just came up with ideas.

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He tried to show that the cathode rays produced from the cathode were really a stream of negatively charged particles called electron.

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He used alpha particles and shot them through gold foil. Most went through and some shot back.

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He took Rutherford's theory and made a model to show it.

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Used mathematical equations to decide the likelihood of where an electron could be. All of this is based on Bohr's theory, just showed the probability of it.

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Evidence began to accumulate which suggested that the atom might not be the solid circle that Dalton had envisioned. This evidence came in the form of the discovery of electrically charged particles and radioactive materials. Based on these new discoveries, Dalton's proposal of a solid, indestructible atom became unacceptable.

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Thomson's model of the atom did explain some of the electrical properties of the atom due to the electrons, but failed to recognize the positive charges in the atom as particles.

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The planetary model of the atom failed to explain why individual atoms produce discrete line spectra. According to Rutherford's model, each individual atom should produce a continuous line spectrum. The second flaw to his model was the fact that electrons orbit the nucleus in a circular fashion.

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Charged electrons moving in an orbit around the nucleus should radiate energy due to the acceleration of the electron in its orbit.

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Nothing so far...

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Round Dall Circle

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Thomson's Plum Pudding

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The Big Bang Theory

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A Bohring Circle

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A Cloud