Electrons and Periodic Table

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Across
  1. 3. O
  2. 4. Under Oxygen
  3. 6. Really want to lose 1 of its 19 electrons
  4. 8. One full shell, One half filled shell
  5. 9. 2,8,4
  6. 11. 2,7
  7. 12. Gained electrons
  8. 15. Atomic number 20
  9. 17. He
  10. 18. Atomic number 12
  11. 19. B
  12. 21. Lost electrons
Down
  1. 1. Fifteen
  2. 2. Atomic number 4
  3. 5. 7 protons
  4. 7. Unreactive and three shells
  5. 8. Three shells and would like one more electron to be happy
  6. 10. 2,1
  7. 13. 13 protons
  8. 14. One proton
  9. 16. Two full shells
  10. 20. Na