His table leaves a hole under yttrium and has three 15-element rows in an f-block floating beneath the main table. Nor is he so constrained by atomic numbers. For instance, element 164 is followed ...

Today’s periodic table. Offnfopt/Wikipedia. But once you give Mendeleev’s table a 90-degree turn, the similarity to the modern version becomes apparent. For example, the halogens – fluorine (F), ...

Can you name everything from Ac to Zr? Test your knowledge of the periodic table and see if you can top the leaderboard ...

A new version of the periodic table of elements has predicted hundreds of highly charged ions that could be used to create the next generation of optical atomic clocks. The periodic table, first ...

The origins of the periodic table, however, go back to the 1860s. Russian chemist Dmitri Mendeleev, building on the work of others, took the 63 known elements — including hydrogen, ...

Periodic Table Day is celebrated every year on … well, we'll let you figure that out in the quiz just below! Plenty of folks have a fascination with the periodic table all year long.

The periodic table stares down from the walls of just about every chemistry lab. The credit for its creation generally goes to Dimitri Mendeleev, a Russian chemist who in 1869 wrote out the known ...