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Johann Dobereiner
Classifies some elements into groups of three's. He calls them triads, and grouped them according to like properties. -
John Newlands
He arranged the elements in octaves, because after 8, the properties would repeat themselves. -
Dmitri Mendeleev
He puts the elemets in a table very similar to the one used today. He leaves spots for the elements that were not already discovered. -
Lothar Meyer
He organised the elements in a table as well according to the increase of atomic mass. -
Henry Moseley
Through his work with X-rays, he determined the actual nuclear charge (atomic number) of the elements*. He rearranged the elements in order of increasing atomic number. -
Glenn T. Seaborg
After co-discovering 10 elements he moved 14 out of the main body and placed them below the Lathanide series and called them the Actinide series.
