Chemistry key words

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Across
  1. 4. Pure substance of one atom type
  2. 5. Unreactive Group 0 element
  3. 7. Smallest particle of an element
  4. 8. Substance formed in reaction
  5. 12. Giant covalent carbon structure
  6. 15. Contains protons and neutrons
  7. 19. Chemical decomposition by electricity
  8. 20. Element not forming positive ions
  9. 25. Soluble base producing hydroxide ions
  10. 26. Unsaturated hydrocarbon family
  11. 28. Loss of electrons
  12. 31. Burning in oxygen
  13. 32. Long-chain molecule
  14. 34. Changes colour with pH
  15. 35. Measure of acidity
  16. 36. Substance used in reaction
  17. 38. Forces holding atoms together
  18. 39. Breaking long hydrocarbons
  19. 40. Electron energy level
  20. 41. Positive particle in nucleus
Down
  1. 1. Negative particle around nucleus
  2. 2. Acid and base form salt
  3. 3. Atom with different neutrons
  4. 5. Neutral particle in nucleus
  5. 6. Chemically joined elements
  6. 9. Produces hydrogen ions
  7. 10. Single carbon layer
  8. 11. Bonding by electron transfer
  9. 13. Reactive Group 1 metal
  10. 14. Bonding with delocalised electrons
  11. 16. Compound containing hydrogen and carbon
  12. 17. Hollow carbon molecule
  13. 18. Saturated hydrocarbon family
  14. 21. Particle between 1–100 nm
  15. 22. Element forming positive ions
  16. 23. Gain of electrons
  17. 24. Contains substances not chemically bonded
  18. 27. Layered carbon conductor
  19. 29. Mixture containing metals
  20. 30. Bonding by electron sharing
  21. 33. Reactive Group 7 element
  22. 37. Neutralises an acid