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What: All material bodies are made up of invisibly small "atoms"
When: 460-370 B.C.
Where: Greece
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What: All matter is made of atoms (atoms are invisible and indestructible); All atoms of a given element are identical in mass and properties; Compounds are formed by a combination of two or more different kinds of atoms; A chemical reaction is a rearrangement of atoms

When: 1804
Where: Manchester, Engla
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What: All matter is made of of tiny particles that are smaller than atoms, which are now called electrons.
When: 1894
Where: England
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What: The description of the structure of atoms
When: 1911
Where: New Zealand
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What: Description of the structure of atoms, especially hydrogen
When: 1913
Where: Denmark
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What: Had continued onto Bohr's theory by formulating a wave equation that accurately calculated the energy levels of electrons in atoms
When: 1926
Where: Austria
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