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Atomic Theory Timeline

Atomos
Democratus, 460 b.c.
Atomos

Billiard Ball Model
John Dalton, 1808

Plum Pudding Model
J.J. Thomson, 1904
Plum Pudding Model

Planetarium Model
Ernest Rutherford, 1911
Planetarium Model

Bohr Model
Niel Bohr, 1913

Refined Bohr Model
Niel Bohr, 1920’s
Refined Bohr Model

Electron Cloud Model
Erwin Schrödinger, 1930’s
Electron Cloud Model

New Quantum Model
Albert Einstein, 1930’s
New Quantum Model

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