Noble gas crossword

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Across
  1. 4. A radioactive noble gas from decay of radium.
  2. 5. A light gas commonly used in balloons.
  3. 7. The mixture of gases surrounding Earth.
  4. 8. A device that can use noble gases for light.
  5. 10. An inert gas found in the Earth's atmosphere.
Down
  1. 1. A heavy noble gas used in anesthesia.
  2. 2. Elements that are inert under standard conditions.
  3. 3. A noble gas used in lighting.
  4. 6. Gases that do not react easily with other elements.
  5. 9. A gas used in colorful advertising signs.