Atomic Models Through the Years

Atomic Models Through the Years

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  • Matter is made up of small individual particles called atomos, which move through empty space and cannot be destoyed, or further divided.  Different types of atomos have different shapes and sizes, which determine the properties of matter.
  • Democritus (460-370 B.C.)
  • Oh yeah, well what holds the atoms together?
  • Ugh!
  • I          Democritus
  • The mass ratios of the elements in these reactions are...
  • -Matter is made up of atoms, which cannot be destroyed or divided. -Atoms of the same element are identical. -Atoms in one element are different from those of another element. -In a chemical reaction, atoms are separated, combined, or rearranged. 
  • John Dalton (1766-1844)
  • Sir William Crookes
  • There's a green flash in the cathode-ray tube!
  • J. J. Thomson (1856-1940)
  • I used the cathode-ray tubes to identify the electron and determine the ratio of the mass of an electron to its electric charge. I'm about to receive a Nobel Prize for identifying the first subatomic particle!
  • Electron
  • Plum Pudding Model
  • Matter containing evenly distributed positive charge
  • I calculated the mass of an electron using an oil-drop experiment.
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