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Use Cases
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Resources
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Pricing
430 B.C.
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Democritus proposed the first idea of the atom. Substances made up of invisible, indestructible particles.
1811
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Proposed Atomic Theory
Dalton's Model
1895
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Discovered x-rays
This led to many discoveries in the Atomic Theory
1897
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Discovered electron to determine the charge to mass ratio of the electron.
Cathode Ray Tube Experiment
Discovered negatively charged electrons
Plum Pudding Model
1911
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Concluded the atom is empty space with a small positive nuclear core
Gold Foil Experiment
Nuclear Model
1913
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Tried to answer question: Why arent electrons pulled into the nucleus?
Bohr's Model
1923
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Hypothesis- If waves can behave like particles, then particles can behave like waves.
Electrons can act like waves
1926
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Heisenberg's Uncertainty Principle
It's impossible to know the position and velocity of an electron at the same time.
Electrons move to fast to track
1927
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Schrodinger's Wave Equation
Treated the electron like a wave
Developed an equation to find the electron in any given place around the nucleus
Solution to this equation was a quantum number
Quantum Model
1932
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Discovered the neutron