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Atomic Timeline

Published on Nov 20, 2015

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MORE DECKS TO EXPLORE

PRESENTATION OUTLINE

1.

440 B.C.

  • Democritus
  • All substances are made of atoms
  • Atoms constantly move
  • Atoms are small hard particles
  • Atoms are uncuttable
2.

1803

  • Dalton
  • Elements combine in specific proportions
  • Atoms of different elements are different
  • Atoms of the same elements are the same
  • He did experiments on combining elements
3.

1897

  • Thomson
  • He did the cathode-ray tube experiment
  • His theory led to the "plum-pudding" model
  • There are small, negatively charged particles in an atom
4.

1911 RUTHERFORD

  • Electrons move in empty space in the atom
  • Most of an atom's mass is in the nucleus
  • Atoms contain mostly empty space.
  • There is a small, dense, positively charged nucleus
  • He conducted the gold foil experiment.
5.

1913

  • Bohr
  • Electrons jump between levels from path to path
  • Electrons travel in definite paths.
6.

20TH CENTURY

  • Modern theory
  • Electron paths cannot be predicted.
  • Electrons are found in electron clouds, not paths

Alyssa Hatch