Dates are included for a frame of reference..  Around 400 B.C.  Atomos => indivisible  He suggested that all substance in the universe was made up.

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Atomic Theory Timeline

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Presentation transcript:

Dates are included for a frame of reference.

 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.

 1803  Atoms = small, dense, spheres  Billiard Ball Model  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

 1897  Discovered the electron, and they were negative  Cathode Ray Tube experiment  Plum pudding model  Immobile electrons

 1911  Gold Foil Experiment  Discovered atom was mostly empty space  Discovered the nucleus  Dense, positive, small, in center  Atomic Model

 1913  Electrons were located in shells (fixed orbits)  Electrons can move to other shells  Planetary Model

 1916  Oil-drop experiment  Mass of an electron  Exact charge of an electron

 1926  Electron cloud of probability  Electron Cloud Model

 1932  Discovered the neutron