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

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.