HISTORICAL DEVELOPMENT OF THE PERIODIC TABLE

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6 Terms

1
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Antoine Laurent Lavoisier

extensive list of 33 elements in which he

made a distinction between metals and

nonmetals

2
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John Jakob Berzelius

-developed table of atomic weights and

introduced letters to symbolize elements

3
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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

4
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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.

5
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Lothar Meyer & Dmitri Mendeleev

-formulated the “periodic law”

-the physical and chemical properties of

elements are functions of their atomic weights

6
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Henry Moseley

-modified periodic law that properties of

elements vary periodically with their atomic

atomic number.