CHEMISTRY · Subjective · CBSE · Chemistry · Classification of Elements and Periodicity in Properties · Classification of Elements and Periodicity in Properties
Problem
Before Mendeleev, several scientists attempted to arrange the elements to show similarities in properties. Describe and evaluate the contributions of the following chemists to the development of the periodic table:
- Johann Döbereiner
- John Newlands
- Alexandre-Émile Béguyer de Chancourtois (the first person to list the known elements in order of increasing atomic mass)
Suggest why Mendeleev is considered the “father” of the periodic table while these other contributions are often overlooked.