Periodic table

By dogweiner947

  • The scientific method

    Sir Francis Bacon published "The Proficience and Advancement of Learning" which contained a description of what would later be known as the scientific method.

  • The Sceptical Chymist

    Robert Boyle published "The Sceptical Chymist" which distinguished between the fields of chemistry and alchemy. The work also features some of the earliest recored ideas of atoms, molecules, and chemical reactions.;

  • Carbon dioxide isolation

    Joseph Black isolated carbon dioxide, which he called "fixed air".

  • Hydrogen discovery

    Henry Cavendish discoveres hydrogen. He discribes it as a colorless, odourless gas that burns and can form an explosive mixture with air.

  • Oxygen isolated

    Carl Wihelm Scheele and Joseph Pristly isolate oxygen.

  • Non metal and metal

    Antoine Lavoisier wrote the first extensive list of elements containing 33 elements & distinguished between metals and non-metals

  • Dalton law

    John Dalton proposed "Dalton's Law" describing the relationship between the components in a mixture of gases.

  • Letters to symbolize

    Jakob Berzelius developed a table of atomic weights & introduced letters to symbolize elements

  • Orginal periodic was founded

    In 1862, French geologist Alexandre-Emile Béguyer de Chancourtois listed the elements on paper tape and wound them, spiral like, around a cylinder. Certain ‘threes’ of elements with similar properties came together down the cylinder. He called his model the ‘telluric screw’.

  • Lothar Meyer

    Lothar Meyer develops an early version of the periodic table, with 28 elements organized by valence

  • Dmitri Mendeleev

    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.

  • Discovery of atomic weight by John Newlands

    In 1864, English chemist John Newlands noticed that, if the elements were arranged in order of atomic weight, there was a periodic similarity every 8 elements. He proposed his ‘law of octaves’ on this.

  • Noble gases discovered

    William Ramsay discovered the Noble Gases.

  • radium and polonium

    Marie and Pierre Curie isolated radium and polonium from pitchblende.

  • radioactivity

    Ernest Rutherford discovered the source of radioactivity as decaying atoms

  • Periodic law modified

    Henry Moseley determined the atomic number of each of the elements and modified the 'Periodic Law'.

  • First transuranium element

    Edwin McMillan and Philip H. Abelson identify neptunium, the lightest and first synthesized transuranium element, found in the products of uranium fission.

  • Glenn Seaborg

    Glenn Seaborg synthesised transuranic elements (the elements after uranium in the periodic table)