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  • 1778, Lavoisier
  • Hi I am Lavoisier, I did the first list of 33 elements, grouping it in gases, metals and non-metals
  • Döbereiner, 1817
  • I am Döbereiner, I did the relationship between the atomic mass of elements and propierties.
  • Chancourtois y Newlands 1862
  • We are Chancourtois and Newlands, weannounce the Law of the octaves: the properties are repeated every eight elements.
  • Meyer 1869
  • Hi, I am Meyer, a german chemical. I showed a certain periodicity in the atomic volume.
  • Mendeleïev 1869
  • I am Mendeleïev, a Russian chemist, who made the first coherent presentation of the similarities of the elements. Classifying the elements according to their atomic masses
  • Mosely 1914
  • Hi, I'm Henry Moseley, determine the experimental values of the nuclear charge or atomic number of each element
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