When was Mendeleev's contribution to the atomic theory published?

Dmitri Mendeleev published his periodic table of elements in 1869. His table arranged the known elements according to their chemical properties and in order of their relative atomic mass. This created several gaps in the periodic table and allowed him to predict eight other undiscovered elements correctly.

Mendeleev, a Russian chemist and inventor, developed the Periodic Law and created the periodic table of elements that is used today. His research has given scientists a better understanding of the atom. Mendeleev was born in 1834 near Tobolsk, Russia and attended Saint Petersburg University. He died in 1907 in Saint Petersburg at age 72.