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Democritus created his theory was created in the 5th century. His theory states that everything is composed of atoms, between atoms there are lines of empty space, also atoms are indestructible. His main thing was that atoms were specific to the materials which they are composed. It was discovered in Greece.

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Dalton contributed in 1803 ,he proposed that all matter was composed of atoms and atoms of an element were identical ,different elements had atoms of different size and mass. He did his discoveries in Manchester

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Dimitri Mendeleev contributed to the theory in 1869. He created the periodic table or at least fixed it. He arranged the periodic table based on increasing atomic mass. he did his work in St. Petersburg.

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Thomson did his discoveries in 1903, he proposed a model of an atom consisting of positive and negative charges. Present in equal amounts so that an atom would be electrically neutral. He did his discoveries at Cambridge.

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Ernest Rutherford contributed his thinking in 1911, he found that the atom was mostly space as well as the mass was in the tiny nucleus. His discoveries where in new Zealand

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Proposed a theory for the hydrogen atom based oh quantum theory that energy is transferred only in certain well defined quantities. electrons should move around the nucleus but only in certain orbits. he did his studies at Copenhagen university

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Schrodinger contributed in 1926, he quantized the hydrogen atom in Bohr's model could be calculated by his equation. He did his discoveries at Oxford