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  • Atom
  • -Atom make up all matter. -Atoms are solid like a billiard ball or bowling ball
  • John Dalton (1804)
  • -Atom cannot be divided , created or destroyed
  • -plum pudding model (chocolate chip cookies). -negative charge (electrons) spread out in a "sea" of a positive charge .
  • J.J. Thomson (1904)
  • -electrons -positively charged matter
  • Discovered the nucleus. -Positive charge in the center. Atoms are mostly empty space
  • Ernest rutherfoed(1909)
  • -Gold foil experiment
  • - electrons in orbits around the nucleus -based on the energy the electron has -still used to draw atoms
  • Niels bohr (1913)
  • -neutron -eletron -proton
  • -electron are in clouds called orbitals -location based on probility
  • -nucleus 1s orbital 2s orbital 3s orbital
  • Quantum model (modern model)(1926)
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