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Lavoiser
Wrote the first extensive list of elements containing 33 elements -
Döbereiner
Created triads which were groups of 3 elements with similar properties -
Newlands
The known elements were arranged in order of atmoic weights -
Medndeleev
Produced a table based on atomic weights but arranged periodically with elements with similar properties under each other. -
Meyer
Compiled a period table of 56 elements based on the periodicity of propertires such as molar volume when arranged in atomic weight. -
Seaborg
Synthesised transuranic elements( the elements after uranium in the period table)