The periodic table of chemical elements, often called the periodic table, organizes all discovered chemical elements in rows (called periods) and columns (called groups) according to increasing atomic ...

Can France claim the first periodic table? Probably not, but a French Geology Professor made a significant advance towards it, even though at the time few people were aware of it. Alexandre Béguyer de ...

Listen to the full series on BBC Sounds ... To make iodine line up with chlorine and bromine in his table, Mendeleev swapped the positions of iodine and tellurium.

The ions formed have a full outer electron shell, so are very stable. See the study guide on groups in the periodic table for more information.

Can you name everything from Ac to Zr? Test your knowledge of the periodic table and see if you can top the leaderboard When you purchase through links on our site, we may earn an affiliate ...