Wrote the first extensive list of elements containing 33 elements & distinguished between metals and non-metals
Described the relationship between the components in a mixture of gases.
John Newlands (octaves)
Arranged the known elements in order of atomic weights & observed similarities between some elements. And developed the Law of Octaves.
Developed a table of atomic weights & introduced letters to symbolize elements
John Dobereiner (triads)
He developed the Law of Triads. Each triad was a group of three elements similar to each other.
Lothar Meyer (table)
published The Modern Theory of Chemistry in which he published the use of atomic weights to group elements. In the work, he arranged 28 elements into 6 families that had similar chemical and physical traits
Published his periodic table, eventually becoming the “father of the periodic table.”
Discovered argon, a new gaseous element that was chemically inert.
Established that “the nuclear charge on a nucleus was proportional to the atomic weight of the element.”