Across
- 1. Major player in the creation of DNA
- 3. Used to blow up balloons
- 6. Third noble gas in period 8
- 8. I am to the left of the periodic table
- 9. I contain 26 protons
- 11. Green plastids
- 12. Makes up 21% of the air
- 13. Atomic number is 92
Down
- 2. Usually used in pools
- 4. Lightest state of matter
- 5. Metal that turns liquid at room temperature
- 7. I take up 80% if the atmosphere
- 10. Poisonous Gaseous halogen