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.