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Timeline created by lissa12345
  • John Dalton

    John Dalton
    Chemists hadn’t yet fully grasped the nature of atoms, as described in the atomic theory proposed by English schoolteacher John Dalton
  • 1860

    Atomic weights had been well enough understood and measured for deeper insights to emerge
  • John Newlands

    Noticed that arranging the known elements in order of increasing atomic weight produced a recurrence of chemical properties every eighth element
  • Bohr

    Bohr
    Bohr’s table added elements discovered -1869
    Created his own version of the table- 1922
  • Dmitri Mendeleev

    Dmitri Mendeleev
    he published his firts timeline, this arrangement placed elements with similar properties into horizontal rows.
  • Mendeleev

    His realized that some groups of similar elements showed a regular increase in atomic weights; other elements with roughly equal atomic weights shared common properties. Mendeleev’s table did more than foretell the existence of new elements. It validated the then-controversial belief in the reality of atoms.
  • 1869

     1869
    Mendeleev realized that the physical and chemical properties of elements were related to their atomic mass in a 'periodic' way, and arranged them so that groups of elements with similar properties fell into vertical columns in his table.
  • Johannes Wislicenus

    Declared that the periodicity of the elements’ properties when arranged by weight indicated that atoms are composed of regular arrangements of smaller particles
  • Mendeleev

    Chemists widely recognized his law as a landmark in chemical knowledge
  • 1907

    1907
    Mendeleev’s death