The noble gases show trends in their physical properties.
The noble gases all have low boiling points:
This is because, going down group 0:
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.
The particles in gases are widely spaced, so the noble gases have low densities: