Such questions exercised physicists greatly in the decades after Dmitri Mendeleev introduced his periodic table of the chemical elements in 1869. They received new impetus around the turn of the ...

Dmitri Mendeleev predicted its presence in 1869, and Clemens Winkler identified it in a mineral sample in 1886, naming it after his nationality. However, half a century passed before many of its ...

And even though there are other scientists who made contributions, it is Russian chemist and inventor Dmitri Mendeleev’s name that is always at the forefront. Mendeleev was the youngest of ...

At the middle of the 19th century, 63 chemical elements were known to science. Before Mendeleev’s discovery, attempts at arranging them in some logical way were made by Johann Doebereiner (1829 ...