Across
- 4. group 17, period 5
- 6. period 4, group 12
- 8. you breath it in
- 9. period 1, reactive nonmetals
- 11. 79 electrons
- 12. what gets put in balloons, noble gas
- 14. 16 protons
- 15. period 2, group 13
Down
- 1. what they put in glowing signs
- 2. 61 neutrons
- 3. 106 protons
- 5. period 6, group 14
- 7. group 8, period 4
- 10. 67 protons,lanthanides
- 13. what you breath out