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Scietific Method Published
Sir Francis Bacon published "The Proficience and Advancement of Learning" which contained a description of what would later be known as the scientific method. -
Beginning of Modern Chemistry
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 -
CO2 Isolated
Joseph Black isolated carbon dioxide, which he called "fixed air". -
Discovers Hydrogen
Henry Cavendish discovered hydrogen as a colorless, odourless gas that burns and can form an explosive mixture with air -
Oxygen Isolated
Carl Wilhelm Scheele and Joseph Priestly independently isolated oxygen -
First List of Elements
Antoine Lavoisier wrote the first extensive list of elements containing 33 elements & distinguished between metals and non-metals -
Daltons Law Proposed
John Dalton proposed "Dalton's Law" describing the relationship between the components in a mixture of gases. -
Elements Grouped
Johann Dobereiner developed groups of 3 elements with similar properties -
First Table of Atomic Weight
Jakob Berzelius developed a table of atomic weights & introduced letters to symbolize elements -
Elements Arranged
John Newlands arranged the known elements in order of atomic weights & observed similarities between some elements -
Early Periodic Tale Created
Lothar Meyer develops an early version of the periodic table, with 28 elements organized by valence -
Periodic Table Created
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. -
Noble Gases Discovered
William Ramsay discovered the Noble Gases. -
Curie's islate Radium & Polonium
Marie and Pierre Curie isolated radium and polonium from pitchblende. -
Source of Radioctivity Discovered
Ernest Rutherford discovered the source of radioactivity as decaying atoms -
Periodic Numbers Determined
Henry Moseley determined the atomic number of each of the elements and modified the 'Periodic Law'. -
Neptunium Identified
Edwin McMillan and Philip H. Abelson identify neptunium, the lightest and first synthesized transuranium element, found in the products of uranium fission. -
Transuranic Elements Synthesised
Glenn Seaborg synthesised transuranic elements (the elements after uranium in the periodic table)