Across
- 4. contains electrons
- 6. indicates number of protons
- 11. combination of metals and nonmetals
- 12. an atom with differing atomic mass
- 14. a charged atom
- 16. positive ion
- 17. indicates number of protons and neutrons
- 18. contains protons and neutrons
Down
- 1. negative ion
- 2. indicates number of energy levels
- 3. indicates valence electrons
- 5. an atom with a specific number of protons
- 6. amount an isotope occurs
- 7. brittle, not conductile
- 8. positive particle
- 9. negative particle
- 10. negative particle
- 13. malleable, conductile
- 15. most basic unit of structure