Across
- 3. I have 8 electrons
- 7. Ba
- 8. Cl
- 9. a source of nuclear energy
- 10. I have 6 neutrons in group 14
- 12. I have 20 neutrons in group 2
- 15. I have 76 electrons
- 17. Sn
- 19. I have 79 electrons
- 20. I have 28 neutrons in group 5
- 21. I have 30 electrons
- 22. A stable particle with a positive electrical charge
- 23. (1,4)
- 24. I have 10 neutrons in group 18
Down
- 1. (7,7)
- 2. Be
- 4. A particle with no electrical charge but same mass as proton
- 5. A stable particle with a negative electrical charge
- 6. (5,7)
- 11. Sc
- 13. (18,3)
- 14. (11,5)
- 16. F
- 18. I have 16 electrons