Chemistry Crossword Puzzle

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Across
  1. 1. includes helium, krypton, neon, and more
  2. 3. distance between wave crests
  3. 8. the letter representation of an element
  4. 10. the smallest part of an element
  5. 11. type of charged particle
  6. 12. lowest amount of frequency
  7. 14. highest amount of frequency
  8. 15. type or structure that deals with the valence electrons
  9. 17. horizontal row on the periodic table
  10. 19. positively charged particle
  11. 20. positively charged item of the nucleus
  12. 21. type of diagram that has up and down arrows
  13. 22. number of waves that pass a certain point per unit of time
  14. 24. chemical substance that cannot be broken down
Down
  1. 2. theory that all substances are composed of atoms
  2. 4. number of protons in the nucleus of an atom
  3. 5. where protons and neutrons stay
  4. 6. the whole arrangement of elements
  5. 7. same protons different neutrons
  6. 9. outer layer of electrons
  7. 10. negatively charged particle
  8. 13. negatively charged item in a nucleus
  9. 16. vertical row on the periodic table
  10. 18. total number of protons and neutrons in the nucleus of an atom
  11. 23. neutral charge in a nucleus