June 30, 2021
For educational institutions
History of the Periodic Table
⟶ Updated 26 Dec 2017 ⟶
List of edits
Johann proposed "Law of Triads"- triads (3) of elements- middle element- average of outside ones
Scientists discover that pattern is beyond triad
Henning Brand discovers Phosphorus
63 elements discovered- Scientists saw patterns between elements
Johann 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 Prize
Reordered Periodic Table, despite atomic masses
Lord Rayleigh discovers Noble Gas, Argon
William Ramsey suggest placing argon in separate group between chlorine and potassium
20th century scientists found why properties of elements reoccur periodically
Ernest Rutherford published how alpha particles were affected by nuclei- uncovering nuclear charge
A. 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 table
Discovery of isotopes led to understanding (atomic number corresponded with properties > than mass)
Periodic Law- Properties of elements are dependent on atomic numbers
Gilbert Newton Lewis discovers bonding electron pairs
Neil Bohr discovers the order of electrons in their shells
Glenn 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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