Across
- 4. Group 1
- 10. Electrons on outermost energy-level
- 13. Shows all electrons
- 15. Group 18
- 17. Groups 3-12
- 19. Top row of bottom two rows
- 22. Massive airship that went down in flames in 1937
- 25. Goes under symbol when writing isotopes
- 28. Group 1, Period 1
- 29. Bottom row of bottom two rows
- 30. Compound of halogens and alkali metal
Down
- 1. Groups 13-16
- 2. Contains protons and neutrons
- 3. Goes above symbol when writing isotopes
- 5. Shows only valence electrons
- 6. Negative charge
- 7. Number of protons
- 8. Neutral charge
- 9. Used to notate isotopes when typing
- 11. Group 2
- 12. Where electrons are located
- 14. Hydrogen used instead of this on Hindenburg
- 16. columns on periodic table
- 18. Positive charge
- 20. Number of protons plus number of neutrons
- 21. Same element but different number of neutrons
- 23. Group 17
- 24. Outermost energy-level
- 26. Also known as orbital
- 27. rows on periodic table