Across
- 3. Protons in the nucleus
- 5. Shiny
- 7. The amount of matter
- 8. Metals in the middle of the periodic table
- 12. Positive charge; part of the nucleus
- 13. Where electrons live
- 15. Outside shell
Down
- 1. Combined mass of neutrons and protons
- 2. Characteristic
- 4. How an atom interacts with other atoms
- 6. Column of elements
- 7. Shiny, conducts electricity, solid, malleable
- 9. Smallest unit of matter
- 10. No charge; part of the nucleus
- 11. Row of elements
- 13. They have their own periodic table
- 14. Orbits the nucleus; has a negative charge