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The Atom

TermDefinition
Dalton's Atomic Theory All matter is made up of indivisible atoms which cannot be created or destroyed.
William Crooks Discovered the Electron, Cathode Ray Tube demonstration
JJ Thompson Determined that electrons were negative. Found E/M ratio.
Robert Millikan Oil drop experiment discovered the size of electron's charge.
Plum Pudding Model Solid Positive sphere with electrons embedded.
Rutherford Discovered the Nucleus. Fired alpha particles at gold foil. Proton
Chadwick Discovered the neutron by firing alpha particles at berylium.
Energy Level The fixed energy value that an electron in an atom may have.
Heisenberg's Uncertainty Principle States that it is impossible to measure at the same time both the velocity and the position of an electron.
Orbital A region of space in which there is a high probability of finding an electron.
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