periodic table

By sammyg

  • periodic table

    By the end of 1860 around 60 elements had been discovered on the periodic table

  • periodic table

    Dmitri Mendeleev produced a table based on atomic weights but arranged 'periodically' with elements with similar properties under each other. His Periodic Table included the 66 known elements organized by atomic weights.

  • periodic table

    William Ramsay discovered the Noble Gases.

  • periodic table

    John Newlands arranged the known elements in order of atomic weights & observed similarities between some elements

  • 1928

    Johann Dobereiner developed groups of 3 elements with similar properties