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