By: Cordelia Keeley

The Basics

  • Symbol: Rn
  • Atomic Number: 86
  • Atomic Weight: 222.02
  • Group: 18 (noble gases)
  • Color: Colorless
  • Classification: Non-Metallic

Additional Information

  • Description: Radon is the heaviest known gas and toxic in large doses
  • Biological Role: No Biological Role
  • Geological Role: Often found in uranium ores
  • Properties: Toxic,Dangerous, Density in solids: 4400 kg m‑3
  • Interesting Facts: Radon can be found in some spring waters and when cooled below freezing point, radon becomes a vibrant yellow. As the temperature is lowered, it turns blood orange then red.