Periodic table

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