Across
- 2. Symbol B
- 4. Symbol Si
- 7. Atomic number 19
- 8. Atomic number 17
- 9. Found in table salt
- 11. Atomic number 4
- 12. Symbol Ar
- 13. Used in balloons
- 14. Used in the atomic bomb
- 15. Symbol Mg
- 18. Atomic number 9
Down
- 1. Atomic number 6
- 3. In our bones
- 5. Used in cellphones
- 6. Most abundant gas
- 7. Symbol P
- 10. Foil
- 16. Symbol S
- 17. A bright colour
- 19. Essential for animals to survive