Periodic table timeline

  • Democritus and Leucippus
    440

    Democritus and Leucippus

    Propose the idea of the atom, an indivisible particle that all matter is made of
  • Francis Bacon

    Francis Bacon

    Published the proficiency and advancement of learning which contained the modern day scientific method
  • Joseph Black

    Joseph Black

    Isolated carbon dioxide which he called "fixed air"
  • Henry Cavendish

    Henry Cavendish

    Discovered hydrogen as a colorless, odorless gas that burns and can form an explosive mixture with air
  • Johann Dobereiner

    Johann Dobereiner

    Developed groups of 3 elements
  • William Ramsay

    William Ramsay

    Discovered the noble gases
  • Marie and Pierce Cusie

    Marie and Pierce Cusie

    Isolated radium and polonium from pitchblende
  • Glen Suaborg

    Glen Suaborg

    Synthesis transepts elements

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