Periodic table timeline

By Pokeybest
  • 440

    Democritus and Leucippus

    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