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.

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

These superheavy elements are the purview of a small group stretching the boundaries of chemistry. Can they extend the periodic table beyond the 118 in it now? Find out scientists are using particle ...