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Antoine Laurent Lavoisier
extensive list of 33 elements in which he
made a distinction between metals and
nonmetals
John Jakob Berzelius
-developed table of atomic weights and
introduced letters to symbolize elements
Johann Dobereiner
“Law of Triads”- forerunner of the concept of groups
-average of atomic weights of the 1st and third
member is equal to the atomic weight of the 2nd
member
John Newlands
“Law of Octaves”- forerunner of the concept of period
arranged the elements by atomic weight and
found out that the 1st and 9th elements have
similar properties.
Lothar Meyer & Dmitri Mendeleev
-formulated the “periodic law”
-the physical and chemical properties of
elements are functions of their atomic weights
Henry Moseley
-modified periodic law that properties of
elements vary periodically with their atomic
atomic number.