chemistry crossword puzzle

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Across
  1. 2. table of all existing elements
  2. 4. a pure substance
  3. 6. electrons less than protons
  4. 9. waves that generate heat
  5. 11. element Au
  6. 12. smallest portion of matter
  7. 13. element Kr
  8. 16. after yellow
  9. 21. product of gas, giving off heat and light
  10. 22. neutral part of an atom
  11. 24. letters representing an element
  12. 25. rate of vibration
  13. 27. negatively charged ion
  14. 28. used to calculate
  15. 32. positive ion formed when metal element loses electrons
  16. 33. weight of an atom
  17. 36. process of energy being released
  18. 37. before orange
  19. 38. amount of energy exerted
  20. 39. any perceivable light
  21. 42. after blue
Down
  1. 1. difference between waves
  2. 3. higher energy than ground state
  3. 5. infinite scale of colors
  4. 7. particle of light
  5. 8. radiation visible to human eye
  6. 10. positively charged ion
  7. 14. before violet
  8. 15. element He
  9. 17. magnet with electrical current
  10. 18. negative part of an atom
  11. 19. element Fe
  12. 20. two similar elements with different mass
  13. 23. no positive or negative charge
  14. 24. digit on the top left of an element
  15. 26. element Co
  16. 28. fewer or more electrons than protons
  17. 29. size of sample
  18. 30. element Sn
  19. 31. negative part of an atom
  20. 34. same number of protons and electrons
  21. 35. before green
  22. 40. after red
  23. 41. positive part of an atom