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Demoritus believed that all matter was made out of substances that could not be divided.
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John Dalton found that when elements such as hydrogen and oxygen combine, they always in certain ratios.
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Thomson believed that all matter is made of indivdual particals called atoms, which cannot be divided.
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Marie hypothesized that radiation doesn't come from the molecule it comes from the atom.
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he became considered the inventor of the quantom theory.
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rutherford fired atoms though gold foil and found out that atoms have parts of atoms that are free and some parts are solid