Events
Dmitri Mendeleev publishes his version of the periodic tableJohn Newlands publishes his law of octavesAlexandre-Émile Béguyer de Chancourtois arranges atoms in weight orderJohann Wolfgang Döbereiner publishes law of triadsJohn Dalton publishes his atomic modelWilliam Ramsay discovers the Noble GasesGlenn Seaborg synthesises transuranic elements (the elements after uranium in the periodic table)Edwin McMillan and Philip H. Abelson identify neptunium, the lightest and first synthesizes transuranium element, found in the products of uranium fission.Henry Moseley determines the atomic number of each of the elements and modified the 'Periodic Law'Ernest Rutherford discovers the source of radioactivity as decaying atomsMarie and Pierre Curie isolates radium and polonium from pitchblendeLothar Meyer develops an early version of the periodic table, with 28 elements organized by valenceJakob Berzelius develops a table of atomic weights & introduced letters to symbolize elementsJohann Dobereiner developed groups of 3 elements with similar propertiesCarl Wilhelm Scheele and Joseph Priestly independently isolates oxygenHenry Cavendish discovers hydrogen as a colorless, odourless gas that burns and can form an explosive mixture with airAntoine Lavoisier writes the first extensive list of elements containing 33 elements & distinguished between metals and non-metalsJoseph Black isolated carbon dioxide, which he called "fixed air"Robert Boyle publishes "The Sceptical Chymist" which was a treatise on the distinction between chemistry and alchemy. It also contains some of the earliest ideas of atoms, molecules, and chemical reaction marking the beginning of the history of modern chemistrySir Francis Bacon publishes "The Proficience and Advancement of Learning" which contained a description of what would later be known as the scientific methodPlato coins term 'elements' (stoicheia)Aristotle proposes the four element theory: earth, air, fire & waterDemocritus and Leucippus propose the idea of the atom, an indivisible particle that all matter is made of
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