john dalton

john dalton
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  • John Dalton: Chemist and Physicist 1766-1844
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  • Dalton's atomic theory proposed that all matter was composed of atoms, indivisible and indestructible building blocks.
  • While all atoms of an element were identical, different elements had atoms of differing size and mass.
  • John Dalton was the first scientist after Democritus to think about the atom and was the first to have an atomic theory
  • There was no previous atom model so Dalton didn't have much to work with. His model was a simple circle 
  • There was no knowledge of a nucleus, proton or electron
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