Chemical reactions occur when elements or compounds combine and create new compounds. Elements are substances that contain only one type of atom and are represented by unique symbols on the periodic ...

Everything we can see and touch, and quite a lot that we can’t as well, is made of tiny particles called atoms. Some substances, like particles of this iron, contain only one kind of atom. Iron is an ...

In a recently published article in the "Proceedings of the National Academy of Sciences" (PNAS), the scientists look back to the beginnings of the periodic system, whose structure is characterized by ...