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Antoine Lavoisier
Wrote the first extensive list of elements containing 33 elements & distinguished between metals and non-metals -
John Dalton
Described the relationship between the components in a mixture of gases. -
Jakob Berzelius
Developed a table of atomic weights & introduced letters to symbolize elements -
Döbereiner (triads)
He developed the Law of Triads. Each triad was a group of three elements similar to each other. (John Döbereiner) -
J. Newlands (octaves)
Arranged the known elements in order of atomic weights & observed similarities between some elements. Developed the Law of Octaves. -
Lothar Meyer (table)
"The Modern Theory of Chemistry" use of atomic weights to group elements (28 elements, 6 families, similar chemical & physical trait) -
Mendeléiev
Published his periodic table, eventually becoming the “father of the periodic table.” (Demitri Mendeléiev) -
Lord Rayleigh
Discovered argon, a new gaseous element that was chemically inert. -
Ernest Rutherford
Established that “the nuclear charge on a nucleus was proportional to the atomic weight of the element.” -
Henry Mosely(table)
Reported that the frequencies are proportional to the squares of whole numbers that are equal to the atomic number plus a constant. (Isotopes of elements) -
Seaburg
Author of the "actinide" concept of heavy element electronic structure, which demonstrated how the heavy elements fit into the Periodic and also he discovered the transuranium elements. -
Periodic Table
Present Periodic Table