UNESCO has declared 2019 as the International Year of the Periodic Table. This is the 150th anniversary of Dmitri Mendeleev’s publication of the “Periodic System” that organized the known elements into a periodic system that predicted the existence of ten unknown elements. The periodic table is not a theory, just a way to organize facts that any theory of elements must explain. Mendeleev’s publication kicked off a storm of discovery in the late 1800’s that continues to the present day – 4 new elements were named in 2016. Read more about the history and impact of the Periodic table.

Or take a 6 question quiz to test your knowledge of the elements!