A section of the periodic table. Nitrogen (red) was thought to not have allotropes with similar structures to heavier elements in its group – phosphorus, arsenic, antimony and bismuth (green) – but ...

In the periodic table of elements there is one golden rule for carbon, oxygen and other light elements: Under high pressures, they have similar structures to heavier elements in the same group of ...

The periodic table is one of the triumphs of science. Even before certain elements had been discovered, this chart could successfully predict their masses, densities, how they would link up with other ...