chemistry

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Across
  1. 2. makes balloons float in air
  2. 3. what we need to breath
  3. 5. chemical noble gas
  4. 8. sometimes people wear it as jewelry
  5. 9. positively charged subatomatic particle
Down
  1. 1. univalent poisonous gaseous halogen
  2. 2. known as natural gas
  3. 4. chemical element with atomatic number 7
  4. 6. can be found in soil and can be crystal at room temp.
  5. 7. naturally in food and a dietary supplement