# Physical properties of the noble gases

contains placed in the vertical column on the far right of the . The elements in group 0 are called the . They exist as single .

Group 0 is on the far right-hand side of the periodic table

The noble gases show trends in their .

## Boiling points

The noble gases all have low :

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

This is because, going down group 0:

• the atoms become larger
• the between the atoms become stronger
• more 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.

## Densities

The of a substance is its per unit . For example, a small piece of a substance with a high mass has a high density.

The in gases are widely spaced, so the noble gases have low densities:

• helium, at the top of group 0, has the lowest density in the group
• density increases going down the group
The densities of group 0 elements