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When: 1926
Where: Austria
Theory: used a mathematical equation to describe the likelihood of finding an electron in a certain postion

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When: 1911
Where: New Zealand
Theory: Atoms have a small charges nucleus surrounded by largely empty space, and are circled by tiny electrons

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When: 1913
Where: Denmark
Theory: Electrons travel in separate orbits around the nucleus and the number of them determined the properties

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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 up of atoms, atoms are invisible/indestructible compounds are formed by a combination of 2 or more 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, Cathode rays are negatively charged. That there is a positive and a negative charge