history of development of the periodic table

By Nas315

  • Johann Dobereiner

    Johann Dobereiner discovered the halogen triad and the alkali metal triad.

  • de Chancourtois

    Created the first periodic table. He assembled the table by classifying chemical elements in an order based on their periodicity of chemical and physical properties.

  • John Newlands

    John Newlands published his own version of the periodic table and developed the Law of Octaves.

  • Dmitri Mendeleev

    Published his periodic table, eventually becoming the “father of the periodic table.”

  • Lord Rayleigh

    discovered argon, a new gaseous element that was chemically inert.

  • William Ramsey

    helped to establish the “zero” group (for “zero valency”) and predicted the future discovery of the element neon.

  • Ernest Rutherford

    established that “the nuclear charge on a nucleus was proportional to the atomic weight of the element.”

  • van den Broek

    established that the atomic weight of an element was approximately equal to the charge on an atom. This charge became the “atomic number” by which periodic table elements are classified.

  • Henry Moseley

    discovered the isotopes of elements. This discovery established that “the properties of the elements varied periodically with atomic number,” not atomic weight, which had been previously accepted under periodic law.

  • Glenn Seaborg

    discovered plutonium and the transuranic elements from 94 to 102. His findings represented the last changes to the periodic table.