Noble Gases

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Across
  1. 2. / A very reactive gas
  2. 3. / Oxygen exists as these
  3. 4. / When particles spread out
  4. 5. / Smallest particle of an element
  5. 7. / Noble gases do not react
  6. 9. / The gas in Bunsen burners
Down
  1. 1. / A gas we breathe out
  2. 5. / The noble gas used in light bulbs
  3. 6. / Noble gas in party balloons
  4. 8. / The noble gas used in advertising signs