How did Johann organize the elements?

Answer 1

Johann Wolfgang Döbereiner organized the elements into triads based on their similar chemical properties and atomic weights in the early 19th century. He noted that the properties of the middle element in each triad were often an average of the properties of the other two. This classification laid the groundwork for the development of the Periodic Table by highlighting the relationship between elements and their properties. His work was one of the early attempts to systematically categorize elements, influencing future scientists in their studies of chemical relationships.