Across
- 3. For formation of bones and teeth
- 7. Atomic number is 9
- 8. Symbol is Al
- 11. flammable gas
- 12. Used in lamps and signs
- 15. something that is important in body functions
- 16. Used to make glue
- 18. number of 4
Down
- 1. Has an atomic number of six
- 2. What some pools have
- 4. Atomic number of 16
- 5. Has 2,3 electrons per shell
- 6. Makes up 78 percent of the earths atmosphere
- 8. symbol is Ar
- 9. Has 2 valence electrons
- 10. What salt is composed of
- 11. what we put in balloons so they can go up
- 13. Milk has this
- 14. a soft silver white metal
- 17. What we breathe