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

By the periodic table’s logic, all d-block elements should have filled s orbitals. But copper defies that logic. It should have the electron configuration [Ar] 3d 9 4s 2.

Discover the history, structure, and importance of the periodic table of elements, from Mendeleev’s discovery to modern scientific applications. When you purchase through links on our site, we ...

Periodic Table Building Blocks are designed for science students from one to three years old, although adults love them as well. The twenty blocks contains all the elements, ...

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 ...

This block of elements would broaden the table to as many as 50 columns (although chemists have already devised more compact ways of arranging such an expanded table).

To account for this, most periodic tables hive off the elements making up this f-block, putting it below the table, leaving a gap in group 3. Fair enough. But there is debate over which of the ...

For the last fifty or so years, the periodic table has been incomplete. ... but there were always a few missing blocks in the periodic table. These elements, with atomic numbers of 113, 115, ...