Physical properties of the noble gases

Group 0 contains non-metal elements placed in the vertical column on the far right of the periodic table. The elements in group 0 are called the noble gases. They exist as single atoms.

Periodic table with the Group 0 Noble Gases coloured in red.Group 0 is on the far right-hand side of the periodic table

The noble gases show trends in their physical properties.

Boiling points

The noble gases all have low boiling points:

  • helium, at the top of group 0, has the lowest boiling point of any element
  • boiling point increases going down the group
Bar chart of the boiling points of elements in Group 0

This is because, going down group 0:

  • the atoms become larger
  • the forces between the atoms become stronger
  • more energy is needed to overcome these forces
Question

Radon is situated below xenon in group 0. Predict the likely boiling point of radon.

The actual boiling point of radon is -61.7 ˚C. An estimate would lie midway between -100 ˚C and -50 ˚C based on the shape of the graph.