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Atomic History Timeline Storyboard

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Atomic Timeline History

Snemalna Knjiga Besedilo

  • DEMOCRITUS
  • HISTORY OF THE ATOM
  • Democritus used the word atomos, Greek for unbreakable, to describe the smallest parts of matter. His is an early atomic theory, though he lacked evidence.
  • THOMSON
  • DALTON
  • The cathode ray experiment helped Thomson realize that the atom could be divided into smaller parts, including a negatively charged part called the electron.
  • Five Statements of Atomic Theory, with evidence
  • He theorized that the positive part of the atom was like pudding with electrons embedded in it.
  • All elements are made of atoms that differ from one another. Atoms of the same element are identical. Atoms combine in whole number ratios.
  • RUTHERFORD
  • With the gold foil experiment, Rutherford discovered the small, dense center of the atom and named it the nucleus.
  • BOHR
  • By studying the spectral lines of hydrogen, Bohr theorized that electrons move at fixed energies, in paths he called orbits. His model described H perfectly.
  • ELECTRON CLOUD MODEL
  • The modern idea of the atom suggests the probability of "locating" an electron in mathematically-determined shapes called orbitals.

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