Across
- 4. Used in fluorescent tube
- 6. Used to disinfect water
- 7. Used in cellular respiration
- 9. Core component of amino acids
- 12. Can be found in bananas, oranges and grapefruit
- 15. Lightest element
- 16. A semiconductor
- 17. Steel-gray, strong, lightweight and brittle alkaline earth metal
- 20. Used in cans, foils and kitchen utensils
Down
- 1. Strengthens tooth enamel
- 2. A safe, non-flammable gas to fill decorative balloons
- 3. Needed for the formation of bones and teeth
- 5. Used in advertising signs
- 8. Used for vaginal yeast infections
- 10. Used in batteries
- 11. Used in pencils
- 13. Maintains a balance of body fluids
- 14. Supports muscle and nerve function, energy production
- 18. Can be found in dairy products
- 19. Tasteless, odourless, brittle solid that is pale yellow