Question

<!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> Write a short note on Dmitri Mendeleev and his contribution to chemistry.

Answer 1

<!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> Dmitri Mendeleev was a Russian chemist who lived from 1834 to 1907. He is considered to be the most important contributor to the development of the periodic table. His version of the periodic table organized elements into rows according to their weights and into columns based on chemical and physical properties.