Across
- 3. negative charge
- 5. number of atoms in a molecule
- 8. outermost shell
- 9. distance from nucleus to outermost shell
- 11. charge of protons and neutrons
- 13. group 18
- 18. shaped without breaking
- 19. area around the nucleus
- 20. organizes elements
- 21. positive charge
- 23. protons and neutrons
- 24. rows
- 25. neutral charge
- 26. paricles within an atom
Down
- 1. center of an atom
- 2. middle of the periodic table
- 4. represents an element
- 6. drawn into thin wire
- 7. combine chemically
- 10. number of protons
- 12. shells
- 14. smallest particle of an element
- 15. group 17
- 16. purest form of an element
- 17. dalton
- 22. columns