https://padlet.com/machapman/dysii0a7yb3o The Chemistry and Elements Timeline en-us 2018-07-18 22:04:28 UTC 2018-07-18 22:53:13 UTC hello@padlet.com https://padlet-assets.s3.amazonaws.com/icons/Balance.png machapman https://padlet.com/machapman/dysii0a7yb3o/wish/270558382 Democritus and Leucippus propose the idea of the atom, an indivisible particle that all matter is made of.]]> 2018-07-18 22:09:13 UTC https://padlet.com/machapman/dysii0a7yb3o/wish/270558382 machapman https://padlet.com/machapman/dysii0a7yb3o/wish/270558504 Aristotle proposes the four element theory: earth, air, fire & water.]]> 2018-07-18 22:12:22 UTC https://padlet.com/machapman/dysii0a7yb3o/wish/270558504 machapman https://padlet.com/machapman/dysii0a7yb3o/wish/270558570 Plato coins term ‘elements’ (stoicheia)]]> 2018-07-18 22:14:01 UTC https://padlet.com/machapman/dysii0a7yb3o/wish/270558570 machapman https://padlet.com/machapman/dysii0a7yb3o/wish/270558583 Sir Francis Bacon published "The Proficience and Advancement of Learning" which contained a description of what would later be known as the scientific method. ]]> 2018-07-18 22:14:40 UTC https://padlet.com/machapman/dysii0a7yb3o/wish/270558583 machapman https://padlet.com/machapman/dysii0a7yb3o/wish/270558659 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]]> 2018-07-18 22:17:21 UTC https://padlet.com/machapman/dysii0a7yb3o/wish/270558659 machapman https://padlet.com/machapman/dysii0a7yb3o/wish/270558749 Joseph Black isolated carbon dioxide, which he called "fixed air".]]> 2018-07-18 22:20:05 UTC https://padlet.com/machapman/dysii0a7yb3o/wish/270558749 machapman https://padlet.com/machapman/dysii0a7yb3o/wish/270558918 Antoine Lavoisier wrote the first extensive list of elements containing 33 elements & distinguished between metals and non-metals.]]> 2018-07-18 22:26:00 UTC https://padlet.com/machapman/dysii0a7yb3o/wish/270558918 machapman https://padlet.com/machapman/dysii0a7yb3o/wish/270559010 Henry Cavendish discovered hydrogen as a colorless, odourless gas that burns and can form an explosive mixture with air]]> 2018-07-18 22:28:30 UTC https://padlet.com/machapman/dysii0a7yb3o/wish/270559010 machapman https://padlet.com/machapman/dysii0a7yb3o/wish/270559074 Carl Wilhelm Scheele and Joseph Priestly independently isolated oxygen.]]> 2018-07-18 22:30:54 UTC https://padlet.com/machapman/dysii0a7yb3o/wish/270559074 machapman https://padlet.com/machapman/dysii0a7yb3o/wish/270559180 John Dalton proposed "Dalton's Law" describing the relationship between the components in a mixture of gases.

]]> 2018-07-18 22:33:09 UTC https://padlet.com/machapman/dysii0a7yb3o/wish/270559180 machapman https://padlet.com/machapman/dysii0a7yb3o/wish/270559228 Jakob Berzelius developed a table of atomic weights & introduced letters to symbolize elements]]> 2018-07-18 22:34:06 UTC https://padlet.com/machapman/dysii0a7yb3o/wish/270559228 machapman https://padlet.com/machapman/dysii0a7yb3o/wish/270559323 Johann Dobereiner developed groups of 3 elements with similar properties.]]> 2018-07-18 22:36:05 UTC https://padlet.com/machapman/dysii0a7yb3o/wish/270559323 machapman https://padlet.com/machapman/dysii0a7yb3o/wish/270559381 John Newlands arranged the known elements in order of atomic weights & observed similarities between some elements.]]> 2018-07-18 22:37:15 UTC https://padlet.com/machapman/dysii0a7yb3o/wish/270559381 machapman https://padlet.com/machapman/dysii0a7yb3o/wish/270559400 Lothar Meyer develops an early version of the periodic table, with 28 elements organized by valence.]]> 2018-07-18 22:37:44 UTC https://padlet.com/machapman/dysii0a7yb3o/wish/270559400 machapman https://padlet.com/machapman/dysii0a7yb3o/wish/270559413 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.]]> 2018-07-18 22:37:58 UTC https://padlet.com/machapman/dysii0a7yb3o/wish/270559413 machapman https://padlet.com/machapman/dysii0a7yb3o/wish/270559603 William Ramsay discovered the Noble Gases.]]> 2018-07-18 22:44:06 UTC https://padlet.com/machapman/dysii0a7yb3o/wish/270559603 machapman https://padlet.com/machapman/dysii0a7yb3o/wish/270559605 Marie and Pierre Curie isolated radium and polonium from pitchblende.]]> 2018-07-18 22:44:12 UTC https://padlet.com/machapman/dysii0a7yb3o/wish/270559605 machapman https://padlet.com/machapman/dysii0a7yb3o/wish/270559612 Ernest Rutherford discovered the source of radioactivity as decaying atoms.]]> 2018-07-18 22:44:26 UTC https://padlet.com/machapman/dysii0a7yb3o/wish/270559612 machapman https://padlet.com/machapman/dysii0a7yb3o/wish/270559619 Henry Moseley determined the atomic number of each of the elements and modified the 'Periodic Law'.]]> 2018-07-18 22:44:37 UTC https://padlet.com/machapman/dysii0a7yb3o/wish/270559619 machapman https://padlet.com/machapman/dysii0a7yb3o/wish/270559657 Glenn Seaborg synthesized transuranic elements (the elements after uranium in the periodic table).]]> 2018-07-18 22:45:00 UTC https://padlet.com/machapman/dysii0a7yb3o/wish/270559657 machapman https://padlet.com/machapman/dysii0a7yb3o/wish/270559666 Edwin McMillan and Philip H. Abelson identify neptunium, the lightest and first synthesized transuranium element, found in the products of uranium fission.]]> 2018-07-18 22:45:12 UTC https://padlet.com/machapman/dysii0a7yb3o/wish/270559666