Science project

Science project

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  • Democritus proposed that atoms are invincible (440 B.C)
  • John Dalton clamed that elements are made of Atoms
  • J.J. Thomson Cathode-ray tube experiment (1897)
  • Democritus proposed that if you kept cutting a substance in half forever, eventually you would end up with an “uncuttable” particle.
  • Thomson's Plum pudding model
  • Scientists knew that elements combined with each other in specific proportions to form compounds.
  • Rutherford's Gold Foil Experiment (1909)
  • Thomson used a cathode-ray tube to conduct an experiment which showed that there are small particles inside atoms. Because the beam moved away from the negatively charged plate and toward the positively charged plate, Thomson knew that the particles must have a negative charge.
  • Niels Bohr Planetary model (1913)
  • negative electrons are scattered throughout soft blobs of positively charged material.
  • Rutherford conducted an experiment in which he shot a beam of positively charged particles into a sheet of gold foil. Rutherford predicted that if atoms were soft, as the plum-pudding model suggested, the particles would pass through the gold and continue in the straight line.
  • Bohr suggested that electrons travel around the nucleus in definite paths. These paths are located at certain “levels” from the nucleus.
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