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Atomic Theory Timeli

QuestionAnswer
460-370 BCE Greek philosopher Geometry and math Atoms are unique and indivisible they are the same size but different shapes Democritus
1897 English Used gas data to determine atoms of elements are unique by mass and solid spheres. John Dalton
1903 English Used cathode ray tube experiment to determine small negatively charged particles inside J.J. Thomson
1911 New Zealand Used gold foil experiment foil experiment to determine nucleus = small dense, electrons are outside, and there is a lot of empty space Ernest Rutherford
1913 Danish Used light & energy to place electrons in quantized energy levels around the nucleus Bohr
1926 Math Used wave function and uncertainty principle to better understand electrons-exist in 3D space not specific orbits Schrodinger and Heisenberg
1932 Added the neutron as a particle in the nucleus that has no charge but the same mass as a proton Chadwick
Created by: Nono Thibodeau
 

 



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