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 ...

See if you can organize the first 25 elements of the periodic table in order in the quiz below. The periodic table as we know it is widely credited to Dmitri Mendeleev, a Russian ...

You may use table navigation commands for the screen reader of your choice. The Periodic Table of Elements. Each entry contains the atomic number, chemical symbol, and atomic mass to two decimal ...