Periodic table

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