Atomic Model Timeline.

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Presentation transcript:

Atomic Model Timeline

Dalton’s Model 1808 Atoms: Extremely small dense particles Indivisible Combine together to form different compounds

Electron Discovery late 1897 Cathode ray tube The discovery of the electron Atom has very light negatively charged particles (electrons) Atoms are neutral, so there must be another positive charge

J.J. Thomson (Plum Pudding Model) 1904

Rutherford Model (Gold Foil Exp.) 1911

Rutherford Model (Gold Foil Exp.) 1911 Most of the positive rays passed to the other side Conclusion: Most of the atom is space Some very few rays deflected back Conclusion: There must be a very dense small particle inside the atom(Nucleus) Some very few rays deflected with small angle Conclusion: the small dense nucleus must be positively charged, that caused repulsion with the positive rays passing near it.

Bohr’s Model 1913 (Orbits)

Schrodinger Model (Orbitals)

Schrodinger Model 1920