Puzzle 42: Periodic Table

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123456789101112131415161718192021222324252627282930
Across
  1. 2. – Inert group 18 element.
  2. 7. – Pure substance.
  3. 9. – Group 2 elements.
  4. 13. – Groups of similar elements.
  5. 15. – Unstable nucleus.
  6. 17. – Group 1 elements.
  7. 19. – One or two-letter element code.
  8. 23. – Atom’s ability to attract electrons.
  9. 25. – Positive charge of nucleus.
  10. 28. – Representative elements.
  11. 30. – Properties repeat by atomic number.
Down
  1. 1. – Repeating patterns of elements.
  2. 3. – Number of protons.
  3. 4. – Shiny, conducts electricity.
  4. 5. – Non-radioactive element.
  5. 6. – Radioactive element series.
  6. 8. – Poor conductor.
  7. 10. – Row of elements.
  8. 11. – Middle block metals.
  9. 12. – Properties of both.
  10. 14. – How elements react.
  11. 16. – Determines bonding.
  12. 18. – Energy to remove electron.
  13. 20. – Reactive group 17 element.
  14. 21. – s, p, d, f classification.
  15. 22. – Middle of table.
  16. 24. – Variants of element.
  17. 26. – Column of elements.
  18. 27. – Rare earth element.
  19. 29. – Average mass of atom.