Radon is a radioactive noble gas. It seeps out of some rocks and can collect in the cellars of houses.
The table shows the relative atomic masses and densities of some noble gases at room temperature and pressure.
| Noble gas | Relative atomic mass | Density in g dm−3\mathrm{g\,dm^{-3}}gdm−3 | Densityrelative atomic mass\displaystyle \frac{\text{Density}}{\text{relative atomic mass}}relative atomic massDensity |
|---|---|---|---|
| helium | 4 | 0.167 | 0.0418 |
| neon | 20 | 0.833 | 0.0417 |
| argon | 40 | 1.67 | 0.0418 |
| krypton | 84 | 3.50 | ? |
| xenon | 131 | 5.46 | 0.0417 |
Calculate the value of densityrelative atomic mass\displaystyle \frac{\text{density}}{\text{relative atomic mass}}relative atomic massdensity for krypton. Give your answer to three significant figures.
Describe the relationship between density and relative atomic mass for the noble gases. Justify your answer using the data.
Radon has a relative atomic mass of 222. Use your answer to (b) to predict the density of radon.
The density of air is 1.20 g dm−3\mathrm{g\,dm^{-3}}gdm−3. Explain why radon collects in cellars.
Radon cannot be removed from the air in a cellar by reacting it with other chemicals.
Explain why, and suggest one way of reducing the amount of radon in a cellar.
38 exam-style questions on Edexcel GCSE Chemistry 7.3 Group 0, covering 7.3.1 The noble gases. Each one has a worked solution and a mark scheme showing where the marks go.