Periodic table

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Across
  1. 3. Another name for group VII
  2. 7. Element is found in period III and has 5 valence electrons
  3. 9. Element is the least reactive in group I
  4. 10. Elements found in group VII, period IV
  5. 12. Number of electrons found in the first electron shell
  6. 13. Most reactive non-metal
  7. 16. Horizontal column in the periodic table
  8. 19. Charge of 0
  9. 20. Element is used in plastic surgery
  10. 21. Element is found in balloons
Down
  1. 1. Name given to elements with the same number of protons but different number of neutrons
  2. 2. Element is the least reactive in group VII
  3. 4. Element has an electronic configuration of 2,8 3
  4. 5. Most reactive element in the periodic table
  5. 6. Least reactive element
  6. 7. Element has an electronic configuration of 2, 8, 8, 1
  7. 8. Element has an electronic configuration of 2, 8, 8, 8, 8, 2
  8. 11. Element is found in period VI and has 2 valence electrons
  9. 14. Mass of 0
  10. 15. Vertical column in the periodic table
  11. 17. Charge of +1
  12. 18. Element is a yellow/green gas