dates are included for a frame of reference.. around 400 b.c. atomos => indivisible he...
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History of the AtomDates are included for a frame of reference.
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Democritus
Around 400 B.C. Atomos => indivisible He suggested that all substance in the
universe was made up of particles so tiny that nothing smaller was possible.
He regarded those particles as unchangeable and indestructible, and as the only content of the universe.
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The “Mocker”
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Dalton
1803 Atoms = small, dense, spheres Billiard Ball Model Atomic Theory
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Dalton
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Dalton’s Atomic Theory
Tiny particles called atoms make up all elements
Atoms of the same element are identical
Compounds are made with whole number ratios of atoms
Chemical reactions are when compounds are broken and reformed
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Thomson
1897 Discovered the electron, and they
were negative Cathode Ray Tube experiment Plum pudding model
Immobile electrons
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Thomson
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Rutherford
1911 Gold Foil Experiment Discovered atom was mostly empty
space Discovered the nucleus
Dense, positive, small, in center Atomic Model
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Rutherford
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Bohr
1913 Electrons were located in shells
(fixed orbits) Electrons can move to other shells Planetary Model
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Bohr
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Millikan
1916 Oil-drop experiment
Mass of an electron Exact charge of an electron
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Millikan’s Oil Drop Experiment
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Schrödinger
1926 Electron cloud of probability Electron Cloud Model
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Electron Cloud Model
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Chadwick
1932 Discovered the neutron