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 ...

Today, with 118 elements, the periodic table is a cornerstone of science ... and use of alternating current (AC), enabling electricity to be transmitted over far greater distances.

Dmitri Mendeleev, who arranged the first version of our current table, predicted the existence and properties of undiscovered elements that would fill the open spaces in his table. Learn more about ...