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Wrote the first extensive list of elements containing 33 elements & distinguished between metals and non-metals
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Described the relationship between the components in a mixture of gases.
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Developed a table of atomic weights & introduced letters to symbolize elements
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He developed the Law of Triads. Each triad was a group of three elements similar to each other. (John Döbereiner)
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Arranged the known elements in order of atomic weights & observed similarities between some elements. Developed the Law of Octaves.
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"The Modern Theory of Chemistry" use of atomic weights to group elements (28 elements, 6 families, similar chemical & physical trait)
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Published his periodic table, eventually becoming the “father of the periodic table.” (Demitri Mendeléiev)
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Discovered argon, a new gaseous element that was chemically inert.
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Established that “the nuclear charge on a nucleus was proportional to the atomic weight of the element.”
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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)
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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.
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Present Periodic Table
