The Periodic Table is a well-organized chart that contains all 118 known elements in the universe. These elements are the ...

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 ...

The discovery of other elements followed regularly and soon it became necessary to arrange them in some sort of order ... line in the diagram of the periodic table above separates the metals ...

But how many of these elements do you know? Test your knowledge and compete with other Live Science readers to see who can ...