Periodic table (detailed cells)
Although precursors to this table exist, its invention is generally credited to Russian chemist Dmitri Mendeleev in 1869. Mendeleev invented the table to illustrate recurring ("periodic") trends in the properties of the elements. The layout of the table has been refined and extended over time, as new elements have been discovered, and new theoretical models have been developed to explain chemical behavior.
Gdańsk University of Technology
The periodic table originally painted in 1904 and discovered during the renovation of the Chemical Auditorium reflects the knowledge of chemistry in the early 20th century.