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Crossword solution:

13 clues for "ARGON":

  1. Radio tube gas
  2. Gaseous element.
  3. Inert gas
  4. Light bulb filler
  5. Light-bulb gas
  6. Element
  7. Element in air.
  8. Element whose name comes from Greek for inactive
  9. Element whose name roughly means 'lazy'
  10. Fluorescent-lamp filler
  11. Gaseous element in the air.
  12. Its a gas
  13. Vacuum-tube gas