The main groups are numbered from 1 to 7 going from ... The zigzag, staircase, line in the diagram of the periodic table above separates the metals, on the left, from non-metals, on the right.

You interact with about two-thirds of the elements of the periodic table every day. Some, like carbon, oxygen, and nitrogen, make up our bodies and the air we breathe. Yet there is also a class of ...

That pun is based on the fact that the main ... periodic table of elements quiz, you have 10 minutes to name as many elements ...