History of the Periodic Table

By umasivaraman
  • Antoine Lavoisier

    Antoine Lavoisier

    Classified elements as metals and nonmetals
  • Johann Wolfang Dobereiner

    Johann Wolfang Dobereiner

    Grouped certain elements into groups of three called Dobereiner's triads. Properties of the middle element such as atomic weight was the average of the other two elements. One triad is Lithium, Sodium and Potassium.
  • John Newlands

    John Newlands

    Assembled the Periodic Table of known elements by atomic mass. He noticed that every eight elements showed similar properties which he called law of octaves.
  • Dimitri Mendeleev

    Dimitri Mendeleev

    Father of the modern periodic table. He left gaps for elements that were not yet discovered for which he gave certain names such as EkaAluminium for Aluminium.
  • Lothar Meyer

    Lothar Meyer

    He further refined the periodic table adding more elements as they were discovered.
  • Henry Moseley

    Henry Moseley

    With the discovery of atomic particles of proton, electron and neutron, he modified the periodic table to be based on atomic number which is the number of protons. This cleared earlier anomalies.