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Democritus thought that all things were composed of atoms. He also said they were composed of each element, water, fire, earth, and wind.
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Dalton explains the idea of atoms, that all things are made of atoms. He also said that all atoms of an element were the same in mass and property.
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Thomson proposed the idea that there were negatively and positively charged particles in an atom called protons and electrons
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Rutherford discovered that atoms have a nucleus that occupies a small part of an atom.
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Bhor made the basis for the modern atomic model. He said that electrons orbit around the nucleus.
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Schrodinger used math to find the electron in a certain position, this is known as the quantum mechanic atom model.
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The Chadwick atom model is the one that we use today. He proposed the idea of neutrons that are particles with no energy charge that when along with protons form the nucleus of an atom.
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