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

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 ...

Elements in group 1 and group 2 are metals ... See the study guide on groups in the periodic table for more information.

and all the elements in group 0 are unreactive non-metals. The zigzag, staircase, line in the diagram of the periodic table above separates the metals, on the left, from non-metals, on the right.