July 31, 2020
For educational institutions
Atomic Theory Timeline
⟶ Updated 22 Oct 2018 ⟶
List of edits
Law of Conservation of Mass - matter cannot be created or destroyed, but can be changed
Dalton's Atomic Theory - all matter is composed of atoms that are indestructible
Oil Drop Experiment - determined the size of an electron
Ernest Rutherford - developed a model of the atom
Rutherford Model - suggested that atoms have nuclei with largely empty space being orbited by small electrons
Niels Bohr - created an atomic model where there are rings to the atom where electrons orbit
Erwin Schrodinger - created the Electron Cloud Model
Electron Cloud Model - model of the atom where electrons locations cannot be determined but can be predicted using equations
James Chadwick - discovered the neutron
Democritus formulated the atomic theory
Antoine Lavoisier discovered the role oxygen plays in combustion and named oxygen and hydrogen
JJ Thomson discovered the electron using the Cathode Ray Experiment.
The Plum pudding model composed by JJ Thomson who concluded that atoms are positively and negatively charged.
John Dalton introduces the atomic theory to chemistry
The Gold Foil experiment by Ernest Rutherford led to the discovery of the proton.
Robert Millikan - performed the Oil Drop Experiment
Cathode Ray Tube Experiment - helped the discovery of the electron by using electricity
Bohr Planetary Model - electrons orbited the atom like a planet does the sun
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