PRESENTATION OUTLINE
ANTOINE-LAURENT DE LAVOISIER
French nobleman and chemist central to the 18th-century Chemical Revolution and a large influence on both the histories of chemistry and biology. He is widely considered to be the "Father of Modern Chemistry".
Lavoisier's Traité Élémentaire de Chimie (Elementary Treatise of Chemistry), which was written in 1789 and first translated into English by the writer Robert Kerr, is considered to be the first modern textbook about chemistry. It contained a list of "simple substances" that Lavoisier believed could not be broken down further, which included oxygen, nitrogen, hydrogen, phosphorus, mercury, zinc and sulfur, which formed the basis for the modern list of elements. Lavoisier's list also included 'light' and 'caloric', which at the time were believed to be material substances. While many leading chemists refused to believe Lavoisier's new revelations, the Elementary Treatise was written well enough to convince the younger generation. However, Lavoisier's descriptions of his elements lack completeness, as he only classified them as metals and non-metals.
JOHANN WOLFGANG DÖBEREINER
Developed
the law of triads, which is a grouping into triads. Examples are lithium, sodium, and potassium which belong to one group because they are all soft reactive metals. The atomic weight of the second member of the triads is roughly the average of the atomic weights of the first and third triads.
ALEXANDER-EMILE BÉGUYER DE CHANCOURTOIS
Published An early form of periodic table in 1862. He was the first to discover the periodicity of the elements. The elements were arranged in a spiral on a cylinder in the order of increasing atomic weight.
Noticed that similar physical and chemical properties of elements
recurred in regular intervals every eighth increasing atomic weights.
