Across
- 2. light metal, third in the periodic table
- 4. alkali metal, found in table salt
- 7. alkaline earth metal, fourth in the periodic table
- 12. alkaline earth metal, important for bones
- 14. alkali metal, essential for plant growth
- 17. element essential for life, found in proteins
- 18. noble gas used in neon signs
- 19. non-metal, basis for organic life
Down
- 1. found in milk
- 3. element used in fertilizers
- 5. noble gas with atomic number 2
- 6. metal used in cans and foil
- 8. halogen used in toothpaste
- 9. halogen, used for disinfecting
- 10. non-metal found in eggs
- 11. the lightest element
- 13. metalloid used in electronics
- 15. essential for respiration
- 16. noble gas, used in light bulbs