History of the Periodic Table
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Updated: 26 Dec 2017
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Created bySonya Callendar
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Johann proposed "Law of Triads"- triads (3) of elements- middle element- average of outside onesScientists discover that pattern is beyond triadHenning Brand discovers Phosphorus63 elements discovered- Scientists saw patterns between elementsJohann Dobereiner notices atomic weight of strontium was halfway between calcium and barium.A.E.Beguyer de Chancourtois discovers periodic table (french geologist)Mendeleev came within one vote of being awarded the Nobel PrizeReordered Periodic Table, despite atomic massesLord Rayleigh discovers Noble Gas, ArgonWilliam Ramsey suggest placing argon in separate group between chlorine and potassium20th century scientists found why properties of elements reoccur periodicallyErnest Rutherford published how alpha particles were affected by nuclei- uncovering nuclear chargeA. van den Broek proposed that the weight of atom was approximately proportional to charge of atom (Later named Atomic Number)Henry Moseley discovered the atomic number of elements using x-rays, reorganizing the periodic tableDiscovery of isotopes led to understanding (atomic number corresponded with properties > than mass)Periodic Law- Properties of elements are dependent on atomic numbersGilbert Newton Lewis discovers bonding electron pairsNeil Bohr discovers the order of electrons in their shellsGlenn Seaborg's discovers plutonium, and all transuranic elements from 94-102.Glenn Seaborg reordered the Periodic Table- put the actinide series below the lanthanide series.Seaborg given Nobel Prize (chemistry). Element 106 named "seaborgium (Sg)" in his honor.
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