Across
- 2. I am expensive
- 3. Group 11 period 5
- 4. Group 9 period 7
- 7. I am put into balloons
- 9. Mg
- 11. You need me to breath
- 15. I have 14 neutrons
- 16. I have 118 electrons
- 18. I have 58 protons
- 22. My atomic number is 80
- 23. I have 7 neutrons
Down
- 1. Co
- 3. Se
- 5. Group 14 period 3
- 6. Er
- 8. Group 5 period 6
- 10. I have 5 neutrons
- 12. I have 10 neutrons
- 13. I am in orange juice
- 14. I have 16 protons
- 17. I have 29 protons
- 19. I am a type of coin
- 20. I am the first element in group 3
- 21. Xe