Electrons on the Move

123456789101112131415
Across
  1. 7. The number of protons or electrons
  2. 8. Cu
  3. 9. Neutrally charged particle
  4. 11. How much one atom of one element weighs
  5. 12. N
  6. 14. O
  7. 15. Na
Down
  1. 1. F
  2. 2. C
  3. 3. H
  4. 4. K
  5. 5. Positively charged particle
  6. 6. Negatively charged particle
  7. 7. They make up everything
  8. 10. The rings surrounding the nucleus of an atom
  9. 13. Fe