important benefactors and scientists-
Creating Some Early Blocks for the Periodic Table
between 1817- 1829 Johann Dobereiner began to sort elements into groups of 3 called triads. He also noticed the atomic weights of strontium was half way between Calcium and barium. these elements carried the similar chemical reactions and properties. In 1829 he discovered a halogen triad of chlorine, bromine, and iodine
between 1817- 1829 Johann Dobereiner began to sort elements into groups of 3 called triads. He also noticed the atomic weights of strontium was half way between Calcium and barium. these elements carried the similar chemical reactions and properties. In 1829 he discovered a halogen triad of chlorine, bromine, and iodine
Precursors to the Periodic Table
A.E. Beguyer de Chancourtois tried to create the periodic table by creating a continuous spiral around a cylinder divided into 16 parts. the elements wrapped around the cylinder. Chancourtois created the first geometric representation of the periodic law.
in 1863 john Newlands proposed the law of octaves which stated that the elements repeated their chemical properties every eighth element. The analogy was ridiculed but was found to be an insight after Mendeleev and Meyer published their periodic tables.
Lothar Meyer and Dmitri Ivanovich Mendeleev produced similar versions of the periodic table at the same time. Meyer's 1864 text book included a abbreviated version of the periodic table. in 1868 Meyer constructed a extended table then gave it to a colleague for evaluation. sadly it was published a year after Mendeleev's.
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Glenn Seaborg discovered the transuranium elements. These would be the Elements categorized with the atomic numbers 94 to 102. the completion of the actinide series allowed Seaborg to develop the periodic table to its current form. These elements should have been placed between the alkaline earth metals and transition metals series of elements but it would make the periodic table become to wide so they placed them under the rest of the elements.
SeaBorg and his colleagues were also responsible for discovering over 100 isotopes.
Glenn Seaborg discovered the transuranium elements. These would be the Elements categorized with the atomic numbers 94 to 102. the completion of the actinide series allowed Seaborg to develop the periodic table to its current form. These elements should have been placed between the alkaline earth metals and transition metals series of elements but it would make the periodic table become to wide so they placed them under the rest of the elements.
SeaBorg and his colleagues were also responsible for discovering over 100 isotopes.
Sites Used-
http://www.bpc.edu/mathscience/chemistry/history_of_the_periodic_table.html
http://www.chemheritage.org/discover/online-resources/chemistry-in-history/themes/the-path-to-the-periodic-table/
http://www.rsc.org/periodic-table/history/about
http://www.bpc.edu/mathscience/chemistry/history_of_the_periodic_table.html
http://www.chemheritage.org/discover/online-resources/chemistry-in-history/themes/the-path-to-the-periodic-table/
http://www.rsc.org/periodic-table/history/about