Periodic table

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