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Atomic Scientist Timeline (Thomson (1897) (Created a "plum…
Atomic Scientist Timeline
Thomson (1897)
Created a "plum-pudding" model.
Electrons are spread evenly throughout the atom.
Electrons are small, negatively charged particles inside an atom.
Conducted the cathode-ray tube experiment
Democritus (440 BCE)
Stated that the atom is a small, hard particle that could not be divided.
Atoms are made of a single material cut into different shapes and sizes.
Schroedinger & Heisenberg (1926-1927)
It is impossible to simultaneously determine the velocity and location of an electron.
Electrons are found in electron clouds.
Rutherford (1909-1911)
The nucleus is small, dense, and positively charged.
Conducted gold foil experiment.
Dalton (1803)
Atoms of different elements are different
Atoms of the same element are the same.
All substances are made up of atoms.
Bohr (1913)
Electrons travel in specific paths, or energy levels.
His idea was scrapped in 1920.