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 ...

chemical character ... on the assumption that the atomic number of aluminum, the thirteenth element in the list, starting from hydrogen, is 13. The period of average life of each member is ...

That pun is based on the fact that the main building blocks in the branch of science are chemical elements, pure substances ...

But sometimes the symbol comes from a name for the element that is not an English word. For example, Lead is a chemical element with the symbol Pb (from the Latin for lead, plumbum).W stands for ...

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.