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 ...

Copper has been used by humans for as much as 7000 years and elements such as gold ... The zigzag, staircase, line in the diagram of the periodic table above separates the metals, on the left ...

There are 118 elements in the periodic table, each with a unique symbol and atomic number. Symbol: A one or two-letter abbreviation used to represent the element. Atomic number: The number of ...