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 ...

Thomas Purdie, a chemistry professor who worked at St Andrews, purchased the periodic table of elements chart in 1888. It likely hung in his classroom for years until he retired in 1909.

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.

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

Scientists have found that our bodies need 28 different elements to function properly. These are almost one-quarter of the periodic table and are mainly found in the first four periods.