The periodic table as we know it is widely credited to Dmitri Mendeleev, a Russian chemist who kept reference cards on the elements and their atomic weight. In 1869, he noticed that the elements ...

A Russian scientist called Dmitri Mendeleev produced one of the first practical periodic tables in the nineteenth century. The modern periodic table is based closely on the ideas he used.

The periodic table of elements is a landmark categorization developed in 1869 by the Russian chemist and inventor Dmitri ...

A Russian scientist called Dmitri Mendeleev produced one of the first practical periodic tables in the nineteenth century. The modern periodic table is based closely on the ideas he used.