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Alexandre-Emile Beguyer De Chancourtois
Proposed his classification of elements based on the updated values of the atomic weights from Stanislao Cannizzaro in 1858 -
Julius Lothar Meyer
In his new book, "Die modernen Theorien der Chemie." Julius created an early version of the periodic table containing 28 elements on 6 groups, organised by their valence -
John Newlands
Similar to Alexandre before him, Newlands proposed the table to be sorted by Atomic Mass and that each element is similar to the one 8 before it -
Dmitri Mendeleev
Describe elements based on both Atomic wight and Valence. he also predicted new elements to appear and when they were later discovered they fit perfectly into the spaces he left. -
Ernest Rutherford
Discovered 3 types of Radiation and name Alpha, Beta and Gamma and that it broke down electrons within Atoms -
William Ramsey
Ramsey and Rayleigh wrote a joint paper describing the new element they found named Argon after removing all the components of air and finding a gas left with one sixteenth of the original volume -
William Ramsey
William Ramsey discovered Neon Krypton and Radon -
Henry Moseley
Labeled the elements with atomic numbers based on the amount of electrons in the atom rather than the atomic mass -
Glenn Seaborg
Identified Lanthanides and Actinides which are elements with an Atomic numbers with 92 and placed them in a section at the bottom of the table