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When: 400 BCE
Where: Greece
Theory: Atoms are the basic building blocks of matter.

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When: 1803
Where: England
Theory: All matter is made of atoms, atoms are invisible/ indestructible compounds are formed by a combination of atoms.

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When: 1869
Where: Russia
Theory: Arranging the 63 elements based on atomic mass into a periodic table.

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When: 1897
Where: England
Theory: Discovered the electron. He demonstrated the cathode rays were negatively charged.

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When: 1911
Where: New Zealand
Theory: Discovered that atoms have a small charged nucleus surrounded by largely empty space, and are circled by tiny electrons

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When: 1913
Where: Denmark
Theory: 1st to discover that electrons travel in seperate orbits around the nucleus and the number of them determines the properties of that element.

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When: 1926
Where:Austria
Theory:Used math equations to describe the likelihood of finding an electron in a certain position.