His principal contribution to chemistry was the 'vis tellurique' (telluric screw), a three-dimensional arrangement of the elements constituting an early form of the periodic classification ... that ...

When the first periodic table was formulated by Mendeleev, it was the only group that contained just a single known element — manganese. In the early twentieth century, several claims were made ...

To celebrate the International Year of the Periodic Table (IYPT) in 2019, we asked clubs to submit new designs for the poster. Below is the 2019 version of the poster. Check below the periodic table ...