Recommandé
Contenu connexe
Tendances
Tendances (20)
Similaire à Periodic table timeline
Similaire à Periodic table timeline (20)
Dernier
Dernier (20)
Periodic table timeline
- 1. 330 BC Aristotle proposes the four element theory: earth, air, fire & water. 360 BC Plato coins term stoicheia means elementary principles of the world 440 BC Democritus and Leucippus propose the idea of the atom, an indivisible particle that all matter is made of.
- 2. The Sceptical ChymistScientific Method 1605 Sir Fancis Bacon published” The Proficiency and Advancement of learning”. 1661 Robert Boyle published “The Sceptical Chymist” which contains the details of the earlier know atoms, molecules and chemical rxn, its known to be the beginning of modern chemistry. Discovery of CO2 1754 Joseph Black isolated carbon dioxide, which he called “fixed air”. Henry Cavendish discovered hydrogen as a colorless, odorless gas that burns can form an explosive mixture with air. 1766 Discovery of H2 Which contained a description of what would later be known as the scientific method.
- 3. 1778 1803 18281828 First Proposed Table Attempt to relate the elements Table based on weight John Dobereiner(triads) Antoine Lavoisier wrote the first extensive list of elements containing 33 elements & distinguished between metals and non-metals Johann Dobereiner developed groups of 3 elements with similar properties. Jakob Berzelius developed a table of atomic weights & introduced letters to symbolize elements. John Dalton proposed “Dalton’s Law” describing the relationship between the components in a mixture of gases.
- 4. 1864 18641864 1894 Discovery of noble gases Dmitri Mendeleev Periodic table Advancement of atomic table based on weight Earlier version for periodic table William Ramsay discovered the Noble Gases. Lothar Meyer develops an early version of the periodic table, with 28 elements organized by valence John Newlands arranged the known elements in order of atomic weight & observed similarities between some elements. 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.
- 5. 1940 1900 1913 1898 Transuranium Element Pioneering research in Radioactivity Source of Radioactivity Henry Moseley Modification Edwin McMillan and Philip H. Abelson identify Neptunium, the lightest and first synthesized Transuranium element, found in the products of Uranium fission. 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’.
- 6. 1940 Yet to come Synthesizing Transuranic Elements Glenn Seaborg synthesized transuranic elements (the elements after Uranium in the periodic table).