Across
- 2. element with four protons
- 4. most abundant element in the universe
- 6. third element in group 18
- 8. commonly used in toothpaste
- 11. lowest boiling point
- 14. people eat bananas for this element
- 15. most common element in earth's atmosphere
- 17. diamonds are made of this element
- 18. lightest metal
- 19. essential for electronic production
- 20. _______ foil
Down
- 1. smells like rotten eggs
- 3. used to disinfect water
- 5. the human body is two thirds of this
- 7. bonds with chlorine to form table salt
- 9. atomic mass of 20.18amu
- 10. element used in fertilizer
- 12. burns bright green
- 13. has 12 protons
- 16. most known for its role in bone development