Atomic Structure Crossword Puzzle

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Across
  1. 3. – Radiation beyond violet.
  2. 6. – Same element, different neutrons.
  3. 8. – c, about three times ten to the eighth.
  4. 13. – Center of the atom.
  5. 15. – Negative particle outside the nucleus.
  6. 19. – Electrons in outer shell.
  7. 21. – Higher energy level.
  8. 23. – Number of protons.
  9. 24. – Waves per second.
Down
  1. 1. – Lowest energy level.
  2. 2. – Positive particle in the nucleus.
  3. 4. – What humans can see.
  4. 5. – Charged atom.
  5. 7. – Particle of light.
  6. 8. – Another name for electron level.
  7. 9. – Distance between wave crests.
  8. 10. – Frequency times wavelength.
  9. 11. – Radiation beyond red.
  10. 12. Protons plus neutrons.
  11. 14. – Range of light colors.
  12. 16. – Regions for electrons.
  13. 17. – Electron “orbit.”
  14. 18. – Neutral particle in the nucleus.
  15. 20. – Wave height.
  16. 22. – Smallest unit of matter.