Periodic Table

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Across
  1. 6. The element in Group 7, period 5.
  2. 9. A property of Group 1.
  3. 11. Group 1.
  4. 12. A non-metal with the symbol 'Kr'.
  5. 13. A property of Group 7.
  6. 17. The most reactive metal in Group 7.
  7. 18. The second most reactive element in Group 0.
  8. 19. The least reactive metal in Group 7.
  9. 21. The element used in swimming pools.
Down
  1. 1. The element in Group 1, period 1.
  2. 2. A non-metal with the symbol of the third letter in the alphabet.
  3. 3. Group 0.
  4. 4. A metal with the symbol 'Zn'.
  5. 5. A metal with the symbol 'Al'.
  6. 7. A metal with the symbol 'Fe'.
  7. 8. A property of Group 1.
  8. 10. The most reactive metal in group 1.
  9. 14. The things that make up the periodic table.
  10. 15. Group 7.
  11. 16. A metal with the symbol 'Au'.
  12. 20. A non-metal with the symbol 'N'.