Plato coins term ‘elements’ (stoicheia)
Sir Francis Bacon published "The Proficience and Advancement of Learning" which contained a description of what would later be known as the scientific method.
Robert Boyle published "The Sceptical Chymist" which was a treatise on the distinction between chemistry and alchemy. It also contained some of the earliest ideas of atoms, molecules, and chemical reaction marking the beginning of the history of modern chemistry
Joseph Black isolated carbon dioxide, which he called "fixed air".
Antoine Lavoisier wrote the first extensive list of elements containing 33 elements & distinguished between metals and non-metals
Henry Cavendish discovered hydrogen as a colorless, odourless gas that burns and can form an explosive mixture with air
Carl Wilhelm Scheele and Joseph Priestly independently isolated oxygen
John Dalton proposed "Dalton's Law" describing the relationship between the components in a mixture of gases.
Jakob Berzelius developed a table of atomic weights & introduced letters to symbolize elements
Johann Dobereiner developed groups of 3 elements with similar properties
John Newlands arranged the known elements in order of atomic weights & observed similarities between some elements
Lothar Meyer develops an early version of the periodic table, with 28 elements organized by valence
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.
William Ramsay discovered the Noble Gases.
Marie and Pierre Curie isolated radium and polonium from pitchblende.
Ernest Rutherford discovered the source of radioactivity as decaying atoms
Henry Moseley determined the atomic number of each of the elements and modified the 'Periodic Law'.
Edwin McMillan and Philip H. Abelson identify neptunium, the lightest and first synthesized transuranium element, found in the products of uranium fission.
Glenn Seaborg synthesised transuranic elements (the elements after uranium in the periodic table)
Periodic Table Timeline
|History & Timelines Index|
|Timelines of Events|
|Next Event Timeline|