What is considered to be one of the first series of events in the study of chemistry?

Final answer:

The early 19th century work of John Dalton, particularly his advancement of atomic theory and the concepts of specific mass ratios in chemical reactions, is considered one of the first major series of events in the study of chemistry. Amedeo Avogadro further developed these ideas by defining Avogadro's number.

Explanation:

The origin of chemistry can be traced back to the practice of alchemy, with attempts to understand the behavior of matter dating back more than 2500 years. However, one of the first series of significant events in the

study of chemistry began in the early 19th century with John Dalton's work in atomic theory, which was based on quantitative measurements and helped establish the concept of atoms and molecules as fundamental units of substances. Dalton was also instrumental in establishing the concept of specific mass ratios in chemical reactions, which led to the development of formula mass - the sum of the average atomic masses of all atoms in a substance's formula. This work was later extended by the Italian physicist

Amedeo Avogadro, who developed the concept of a fixed number of atoms or molecules in a mole, known today as Avogadro's number.

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