Here are the most important things about gases to remember:

  • Gases assume the shape and volume of their container.
  • Gases have lower densities than their solid or liquid phases.
  • Gases are more easily compressed than their solid or liquid phases.
  • Gases will mix completely and evenly when confined to the same volume.
  • All elements in Group VIII are gases. These gases are known as the noble gases.
  • Elements that are gases at room temperature and normal pressure are all nonmetals.
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