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Lavoisier recognizes and names Oxygen
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Period: to
History of the Periodic Table
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Lavoisier recognizes and names Hydrogen
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Lavoisier discovers the Law Of Mass
The Law of Mass- "Mass is neither created nor destroyed in chemical reactions. In other words, the mass of any one element at the beginning of a reaction will equal the mass of that element at the end of the reaction." -
John Döbereiner attempts to classify the elements.
In 1817, Johann Wolfgang Döbereiner began to formulate one of the earliest attempts to classify the elements. -
John Döbereiner forms his Triad law
Definition of Triad law:-"Chemically analogous elements arranged in increasing order of their atomic weights formed well marked groups of three called Triads in which the atomic weight of the middle element was found to be generally the {Arthmetic mean} of the atomic weights of the other two elements" -
John Newlands forms his Law of Octaves
John Newlands classifies all 62 known elements into 8 groups -
Lothar Meyer publishes his personal Periodic Table
Lothar publishes his personal Periodic Table but by valence, not atomic weight -
Mendeleev publishes his personal Periodic Table
Mendleev publishes his periodic table in a Russian Journal. -
Glenn Seaborg adds the actinide series to Mendeleev's Periodic Table
Glenn Seaborg changes and adds the actinide series to Mendeleev's Periodic Table adding elements 89-103