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-380 B.C
-Greece
-He developed the concept of the atom. He believed everything was made up of indestructible, microscopic atoms.

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-1803
- England
-He believed all matter is made of invisible, indestructible atoms. Also, that compounds are formed by a combination of 2+ different kinds of atoms.

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-1863
-Russia
-He formulated the Periodic Law, created a simpler version of the modern Periodic Table and used it to correct the properties of some already discovered elements.

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-1897
-Britain
- Discovered the electron

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-1911
-Britain
- He discovered atoms have a small charged nucleus, surrounded by empty space, and are encircled by tiny electrons.

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-1913
- Copenhagen
- the hydrogen atom based on quantum theory that energy is transferred only in certain well defined quantities. Electrons should move around the nucleus but only in prescribed orbits. When jumping from one orbit to another with lower energy, a light quantum is emitted.

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-1926
-Austria
- He used mathematical equations to describe the likelihood of finding an electron in a certain position